The Best Network Penetration Testing Tools

Modern networks are sprawling, dynamic, and under constant pressure from evolving threats. Security teams often face a critical challenge of how to identify real weaknesses before an attacker does. Recent vulnerability data shows that a significant portion of exploited vulnerabilities are weaponized very quickly. In one analysis, about 33% of critical vulnerabilities were exploited within 24 hours of disclosure.

The wrong choice of penetration-testing software can lead to incomplete visibility, inconsistent results, or even missed vulnerabilities that leave critical assets exposed. Choosing the right network penetration-testing tool ensures accuracy, efficiency, and actionable insights.

Penetration testing requires cybersecurity consultants to think like hackers. Automated tools save time and perform repetitive tasks, such a brute force password cracking, that couldn’t be performed manually in a reasonable length of time.

Network Penetration Testing Tools can help your organization avoid the following pain points:

• Undetected Vulnerabilities: Missing critical weaknesses that attackers could exploit.
• Inefficient Testing: Wasting time on low-risk systems or manual processes.
• Compliance Gaps: Failing to meet regulatory or industry security standards.
• Delayed Remediation: Slow identification and fixing of security issues.
• Incomplete Visibility: Overlooking hidden assets, shadow IT, or cloud misconfigurations.
• Alert Fatigue: Being overwhelmed by low-priority warnings makes it hard to focus on real threats.

In this guide, we explore the top network penetration testing tools available today. We show you which deliver real value and why.

Here is our list of the best network penetration testing tools: 

1. Intruder A cloud-based security tool that finds vulnerabilities and exposed assets in networks, cloud services, and web applications.
2. Nmap A canonical network discovery and port/service fingerprinting tool.
3. Metasploit Framework A Mature exploitation and post-exploit platform.
4. Tenable Nessus Broad commercial vulnerability scanning and CVE coverage.
5. OpenVAS A full-featured open-source vulnerability scanner.
6. Wireshark Packet-level analysis and protocol forensics
7. Cobalt Strike Adversary-emulation and command-and-control (commercial, dual-use).

Penetration testing tools are closely connected to vulnerability managers. However, there is a fine line between automated network pen-testing tools and vulnerability scanners.

As a rule of thumb, a vulnerability scanner will work programmatically down a list of known exploits and check the system for the presence of that fault. A penetration tester will look for the same weaknesses and then launch an attack appropriate to the specific loophole to break into the system.

If you need to know more, explore our vendor highlight section just below, or skip to our detailed vendor reviews. 

Βest network penetration testing tools highlights

Key points to consider before purchasing a network penetration testing tool

Here are the key points to consider before choosing or purchasing a network penetration testing tool:

• Fit for purpose: The first question is whether the tool actually matches the scope of your testing. Mapping your threat model to tool capabilities prevents wasted spend and blind spots.
• Depth and accuracy of detection: A tool that finds “everything” but generates noise will drain analyst hours. You want engines validated against real-world environments, not just lab benchmarks.
• Operational scalability: The tool should easily handle thousands of hosts across on-prem, cloud, and hybrid environments. Performance under stress (concurrent scans, throttling, stealth modes) is as important as speed in isolation.
• Usability and integration: Can you use the tool to automate tasks, script repeatable workflows, and generate reports that both engineers and executives can act on? A steep learning curve or weak reporting kills adoption fast.
• Frequency of updates and strength of vendor/community support: Strong vendor support, frequent updates, and an active user community are leading indicators of long-term value. This is where commercial vs open-source trade-offs often become most visible.
• Total cost and compliance guardrails: Check that the tool aligns with regulatory frameworks (PCI DSS, ISO 27001, etc.). Unauthorized scanning can create liabilities just as dangerous as an unpatched system.

To dive deeper into how we incorporate these into our research and review methodology, skip to our detailed methodology section.

Typical hacker tools for penetration testing

While vulnerability scanners don’t need any skills to run, some on-demand scanners can be an excellent overall system run-through that indicates to the hacker which attacks strategy to use. So, in some cases, on-demand vulnerability scanners can be counted as penetration testing tools.

At the other end of the spectrum, the typical hacker toolkit includes some old, tried, and tested tools that are free to use and are widely known to be the mainstays of any hacker toolkit. Penetration testers need to use those same tools.

So, there is a wide range of tools to consider when you are kitting out to perform penetration testing.

Network penetration testing tools

Penetration testing falls into two broad categories:

• Endpoint penetration testing
• Network penetration testing

While endpoint penetration testing looks at weaknesses in operating systems and software, network penetration testing aims for communications weaknesses, such as open ports. Although the ultimate goal is to get onto an endpoint, every type of hacker attack needs to pass through a network to reach a target.

Even after an endpoint has been breached, network attacks don’t stop. Many common network attacks can only be performed from within the network. These secondary network attacks are aimed at moving across a network to search or infect other endpoints.

So, the category of network penetration testing tools includes systems to get you into a network and systems to document the network and investigate ways into endpoints.

The Best Network Penetration Tools

As the range of helpful network penetration testing tools includes older, accessible, and quick services to complete system scanning services that cost a lot of money, you can balance your budget by mixing your toolkit with utilities from across the price spectrum.

You can read more about each of these systems in the following sections.

1. Intruder

Best For: Mid-market security teams that need automated vulnerability scanning, attack surface discovery, and cloud security monitoring

Price: Starts at $149 per month

Intruder is a security testing and monitoring tool that identifies vulnerabilities, misconfigurations, and exposures in networks, systems, and applications. It performs automated scans against known threats, alerts on newly discovered risks, and helps organizations detect weaknesses before attackers can exploit them.

In the context of penetration testing, Intruder supports the early stages by highlighting high‑risk targets and potential attack paths. It offers platforms that help penetration testers work efficiently and comprehensively. Its Vulnerability Management and AI Security Automation scan networks, systems, and applications to find and prioritize critical vulnerabilities.

The Attack Surface, Integrations, and Cloud Security features map hidden assets and track changes. They also streamline reporting and remediation through workflow and compliance integrations. Together, these tools give testers a full view of the environment, help prioritize risks, and support well-documented, actionable penetration testing results.

Intruder Key Features:

• Attack Surface Management: Automatically discovers newly exposed assets and shadow IT to detect risks early.
• Vulnerability Management: Scans infrastructure and applications to identify vulnerabilities, misconfigurations, and emerging threats.
• Risk‑Based Prioritization: Ranks findings by risk to reduce alert fatigue and focus testing on high‑impact issues.
• Cloud Security Posture Management (CSPM): Monitors AWS, Azure, and Google Cloud environments with daily configuration checks.
• Dynamic Application Security Testing (DAST): Identifies security issues in web applications.
• Continuous Monitoring: Tracks environmental changes to surface new risks between scheduled tests.
• Integrations & Workflow Support: Integrates with compliance, ticketing, and remediation tools to streamline pen testing and reporting.

Unique Buying Proposition

Intruder’s unique value proposition is continuous, real-time monitoring of on-premises systems, cloud accounts, and web applications. It actively tracks changes in your environment, flags newly exposed assets, and identifies misconfigurations as they appear. Based on experience, this approach enables structured, repeatable penetration testing through smooth integration with compliance, ticketing, and remediation workflows.

Although other tools offer similar capabilities, Intruder differentiates itself through its simplicity, continuous visibility, and risk-focused automation in a way that makes security insights easy to act on.

Feature-In-Focus: Automated Vulnerability Scanning and Risk Prioritization

Intruder integrates broad automated coverage with smart prioritization. It then highlights the most critical vulnerabilities and reduces noise to help you focus on remediation. Its cloud-native approach enables you to quickly scan external assets, internal networks, and cloud infrastructure on schedule, receive clear, actionable risk reports, and integrate findings into ticketing or development workflows. The result is ongoing, repeatable, and prioritized visibility into vulnerabilities that supports both security teams and risk management.

Why do we recommend Intruder?

We recommend Intruder as a pen testing tool because it strengthens the most critical phases of a penetration test: discovery, prioritization, and validation. It continuously identifies exposed assets, vulnerabilities, and misconfigurations across on-premises, cloud, and web environments.

Its risk-based prioritization, attack-surface monitoring, and cloud security checks reduce noise and help testers focus on the issues that matter most. Although it does not exploit vulnerabilities, Intruder supports manual penetration testing by ensuring critical exposures are not missed, and testing efforts remain focused and efficient.

Who is Intruder recommended for?

Intruder is mostly aimed at mid-market security and IT teams that need automated vulnerability scanning, attack-surface discovery, and cloud security monitoring. It is also suited to organizations with hybrid cloud and changing environments that need continuous visibility into security risks.

Intruder uses a cloud‑based subscription model with multiple paid plans, including Essential, Cloud, Pro, and Enterprise. Pricing varies based on your chosen plan and the number of targets and features you need. There is a 14‑day free trial of the Cloud plan, including full access and up to five target licenses.

Intruder is typically delivered as a cloud application that you access via a browser. It supports monthly or annual billing, and includes integration options and support within the chosen plan.

2. Nmap

Best For: Anyone who needs a cost-effective way to understand network exposure

Price: Free and open-source

Nmap (Network Mapper) is a network reconnaissance and discovery tool used to identify live hosts, enumerate open ports, determine service and version information, and perform OS fingerprinting. Nmap is not an exploitation framework. It maps the attack surface and reduces the scope for deeper testing, but rarely delivers reliable exploit validation.

In penetration testing, network reconnaissance is the first and most critical phase. Nmap dominates that role. Even though it is not an exploitation framework, you’ll need it to accurately map your network before pen testing. Nmap has become the foundation of nearly every assessment due to its reliability and extensibility.

In other words, Nmap is the indispensable reconnaissance foundation for any network penetration test. It reliably discovers live hosts, maps open ports, identifies services and versions, and fingerprints operating systems. However, some NSE scripts can be noisy or produce false positives. UDP and OS detection may also be slow or inconclusive. The core project has no commercial SLA, so plan for validation, careful tuning, and external support to handle exploitation and enterprise requirements.

Nmap Key Features:

• Host Discover: Quickly finds which IPs are alive using ICMP, ARP, or TCP probes.
• Port Scanning Variety: Multiple scan types let you detect open, closed, or filtered ports and adapt to firewalls or privilege limits.
• Service & Version Detection: Probe open ports to identify the application and version so that you can map them to known vulnerabilities.
• OS Fingerprinting: Infers the target operating system and device type from TCP/IP behavior to help choose applicable exploits.
• Nmap Scripting Engine (NSE): Runs modular Lua scripts for discovery, vulnerability checks, brute force attempts, and custom tests.
• Integration & Ecosystem: Works with Metasploit, scanners, SIEMs, and custom pipelines; a vast community of scripts extends its capabilities.
• GUI Front-end (Zenmap): Provides visual profiles, saved scans, and a more straightforward user interface for analysts who prefer a graphical interface.

Unique Buying Proposition

Nmap’s biggest selling point is its ability to reliably and efficiently map the entire attack surface of a network.

It is fast, accurate, and flexible at finding hosts, identifying services, and detecting operating systems. Its scripting engine helps you spot vulnerabilities and misconfigurations and provides a clear view of your systems, services, and potential entry points.

Feature-In-Focus: Network Discovery and Port Scanning

Nmap’s network discovery and port scanning feature identifies live hosts on a network and determines which ports, services, and protocols are accessible on those hosts. As a penetration tester, you can use it to reliably map reachable hosts and exposed services. Identifying these hosts and services allows you to determine viable attack paths and focus efforts on the most relevant targets.

Why do we recommend Nmap?

We recommend Nmap because it is the most reliable tool for mapping a network before any deeper penetration testing begins. Nmap is open-source, widely supported, and trusted by researchers and enterprises alike. It is a proven foundation for any penetration test.

Who is Nmap recommended for?

Nmap is suitable for anyone who needs a reliable, cost-effective way to understand network exposure, from SMBs securing their first assets to global enterprises running structured penetration tests.

Nmap itself is fundamentally free and open‑source for end users: you can download and use the full scanner on Linux, Windows, and macOS at no cost under the Nmap Public Source License. The core tool runs on‑premises or on your own cloud/virtual servers and does not require ongoing billing.

Nmap offers OEM redistribution licenses with one‑time fees and optional annual maintenance. The OEM redistribution license is intended for companies that want to include Nmap’s scanning technology in their commercial products.

3. Metasploit Framework

Best For: Enterprise security teams, red and blue teams, penetration testers, and ethical hackers

Price: Free and open-source

Metasploit Framework is an open-source exploitation and post-exploitation framework used to develop, test, and execute exploit code against remote systems. It is owned by Rapid7, a US-based security company.

Metasploit provides a modular library of exploits, payloads, auxiliary scanners, post-exploitation modules, encoders, and listeners that enable you to chain discovery, compromise, and persistence in a repeatable manner. After you map targets with Nmap, for instance, you use Metasploit’s modular exploits and payloads (including Meterpreter) to validate vulnerabilities, obtain footholds, and automate follow-up tasks.

However, it requires operator expertise and lacks the polish and reporting features of commercial vulnerability management platforms. Choose Metasploit when your goal is to validate vulnerabilities, test defenses, or simulate attack paths. Treat it as your exploitation and validation backbone, but pair it with discovery tools (such as Nmap or Nessus) for coverage and commercial platforms for governance and reporting. Used responsibly, Metasploit bridges the gap between theoretical risk and demonstrated impact in a way few other tools can match.

Metasploit Framework Key Features:

• Exploit Library: A large, well-maintained collection of exploit modules for various platforms.
• Payloads (Meterpreter): Advanced in-memory payload for interactive post-exploitation (fileless operations, tunnel/pivot, in-memory execution).
• Auxiliary Modules: Scanners, fuzzers, and brute-force tools for discovery and pre-exploit checks.
• Post-exploitation Modules: Credential harvesting, persistence, lateral-movement helpers, data exfiltration.
• Console, API, and Scripting: Msfconsole, RPC/API, and scripting for automation and CI/CD integration.
• Session Handling & Pivoting: Session routing, SOCKS/proxying, and pivoting to reach internal targets.
• Integration: Imports Nmap/Nessus output, works with other toolchains and reporting pipelines.

Unique Buying Proposition

Metasploit’s competitive advantage is that it converts reconnaissance into a reliable, repeatable compromise. Its mature, modular exploit and payload library (notably Meterpreter), together with auxiliary and post-exploitation modules, lets you automate end-to-end attack chains and validate exploitability.

Scripting and integration capabilities enable pivoting and the production of reproducible evidence of impact. Red teams and enterprise testers rely on it to demonstrate end-to-end risk.

Feature-In-Focus: Integrated Exploitation

The feature in focus of the Metasploit Framework as a penetration testing tool is its integrated exploitation capability. It allows you to turn identified vulnerabilities into controlled, repeatable exploits. The integrated exploitation capability enables validation of real‑world impact through post‑exploitation activities.

Why do we recommend Metasploit Framework?

We recommend Metasploit because it allows penetration testers and red teams to move beyond simple vulnerability discovery to actual exploitation and post-exploitation workflows. You can use it to validate real-world risk and produce reproducible evidence for remediation.

Who is Metasploit Framework recommended for?

Metasploit is suitable for enterprise security teams, red and blue teams, penetration testers, and ethical hackers who need to validate vulnerabilities, test defenses, and simulate attack chains safely in permissioned environments.

It is also helpful for security researchers and educators who want a hands-on platform to learn exploitation techniques and test defensive controls.

The Metasploit Framework (the core edition) is free and open-source. Rapid7 also sells commercial editions (Metasploit Pro and other paid offerings) that add a web UI, automation, reporting, and enterprise support for a fee. If you need SLAs, team workflows, or advanced commercial features, you may consider the Pro edition. But if you need raw exploit capability and scripting, the free Framework is industry-standard

4. Tenable Nessus

Best For: Medium to large organizations that need a reliable way to assess and rank vulnerabilities

Price: Pro edition starts at $4,719.25/Year

Tenable Nessus Nessus is a widely used vulnerability assessment tool. It works by scanning networked systems to identify vulnerabilities, misconfigurations, missing patches, default credentials, and compliance gaps. Tenable, the company behind Nessus, was recognized as a Customers’ Choice in the 2025 Gartner Peer Insights Voice of the Customer report for Vulnerability Assessment.

Nessus is one of the most reliable starting points for a penetration test because it provides breadth and accuracy before you move into exploitation. You can use it to systematically map an environment’s security posture, uncover exploitable weaknesses, rank them by severity, and provide clear remediation guidance. The software runs on your own infrastructure (on‑premises or within cloud/virtual environments you control).

Based on our extensive assessment of Nessus as a network pen testing tool, our advice is simple: Adopt it as the middle layer in your pen-testing workflow. Feed Nmap/asset lists into it, and use its updated plugin checks and scoring (CVSS/EPSS/VPR) to pick high-value targets, then hand-validated targets to your exploitation stack. If you follow this approach, you will reduce wasted effort, limit noisy exploitation on low-impact systems, and produce remediation-ready reports your ops and compliance teams can act on.

Tenable Nessus Key Features:

• Comprehensive Vulnerability Scanning: Maps hosts and services to a massive, regularly updated vulnerability database.
• Risk Scoring (CVSS v4, EPSS, VPR): Prioritizes vulnerabilities by severity and likelihood of exploitation.
• Cloud & External Attack Surface Scanning (Expert edition): Extends visibility to cloud workloads and internet-facing assets.
• Web Application Scanning: Includes basic scanning for common web vulnerabilities (expandable with Expert edition).
• Customizable Reporting: Generates exportable, compliance-ready reports for IT, management, or auditors.
• Live Results: Automatically reassesses risk with every plugin update, without needing a full scan.

Unique Buying Proposition

Nessus bridges the gap between basic discovery tools (e.g., Nmap) and deeper exploitation tools (e.g., Metasploit). And what is that gap, you may ask?

The gap is knowing which hosts and services in your network are actually vulnerable and worth targeting. Nessus fills that gap by matching services to its updated vulnerability database, scoring risks, and providing you with remediation guidance.

Feature-In-Focus: Vulnerability Scanning and Assessment

The Vulnerability Scanning and Assessment feature identifies known vulnerabilities, misconfigurations, and missing patches across systems, networks, and applications, providing detailed severity ratings and remediation guidance.

This feature enables pen testers to gain a precise understanding of an environment’s security weaknesses. It also allows them to prioritize targets, focus testing efforts efficiently, and provide actionable recommendations.

Why do we recommend Tenable Nessus?

We recommend Nessus because it plays a key role in the network penetration testing chain. It takes the raw discovery you get from, say, Nmap and translates it into a prioritized list of real risks, complete with remediation guidance.

You can then use the information obtained to fully exploit the identified vulnerabilities as an ethical hacker or penetration tester.

Who is Tenable Nessus recommended for?

Nessus is best suited for medium to large organizations that need a reliable way to continuously assess and rank vulnerabilities across their networks.

Security teams, MSPs, and penetration testers benefit most because it scales easily, integrates seamlessly with existing workflows, and provides the necessary context to determine which vulnerabilities to validate or further exploit.

Nessus comes in three editions: Essentials, Pro, and Expert. Essentials is free but limited to 16 IPs, mainly for learning and personal use. The Pro edition, priced at approximately $4,390 per year, includes unlimited vulnerability assessments, advanced scoring, compliance auditing, and configurable reports. Expert edition starts at about $6,390 per year and includes everything in Pro, plus external attack-surface scanning, cloud infrastructure assessments, and expanded web app scanning.

5. OpenVAS

Best For: Security teams, penetration testers, and organizations that need a robust vulnerability assessment

Price: Free and open-source

OpenVAS (Open Vulnerability Assessment System) is a free, open-source vulnerability scanner maintained under the Greenbone Vulnerability Management (GVM) framework. It works much like Nessus in its early open-source days. That is, you point it at network assets, and it systematically probes them against a large vulnerability test (VT) database to uncover misconfigurations, outdated software, missing patches, and common security flaws.

In a penetration testing workflow, OpenVAS serves as the vulnerability assessment component. It sits in the same middle layer as Nessus. It does not perform discovery or exploitation. Its role is to bridge the two by identifying which services are vulnerable and ranking them so you know where to focus deeper testing.

In a nutshell, OpenVAS is one of the most capable open-source vulnerability scanners available today, and it has become a staple in many penetration testing workflows. From my understanding of how OpenVAS works, the right time to choose it is when cost control, customization, and open-source transparency outweigh the need for slick interfaces or guaranteed SLAs.

If your team has the technical capacity to tune and validate results, OpenVAS can deliver broad, repeatable assessments that rival commercial scanners. But if you need speed, guaranteed accuracy, or vendor-backed support, a paid tool such as Nessus will better serve you.

OpenVAS Key Features:

• Comprehensive vulnerability scanning: Uses a vast library of Network Vulnerability Tests (NVTs) to detect misconfigurations, weak services, and known vulnerabilities.
• Regularly updated feeds: Greenbone community and commercial feeds provide continuous updates to keep detection current with emerging threats.
• Compliance auditing: Built-in checks for common standards such as PCI-DSS, HIPAA, ISO 27001, and more.
• Flexible scan configuration: Supports targeted scans (single host) or broad network sweeps with fine-grained tuning.
• Detailed reporting: Generates reports in multiple formats (HTML, PDF, XML, TXT) tailored for both engineers and compliance teams.
• Open-source foundation: Fully free under GPL/NPSL with community-driven contributions, and commercial options for extended support.
• Centralized management: Can be integrated with Greenbone Security Assistant for managing multiple scans and results via a web interface.

Unique Buying Proposition

OpenVAS’s unique value is that it delivers enterprise-grade vulnerability assessment as a fully open-source platform. In practical penetration testing workflows, I have seen OpenVAS used to address the same gap as Nessus. You take discovery data from Nmap, run targeted OpenVAS scans, and then move only the confirmed, high-priority issues into an exploitation framework such as Metasploit.

The difference is cost and control. OpenVAS can be deployed on-prem at zero license cost, and you can modify scan configs or even author your own NVTs (Network Vulnerability Tests), which is impossible with closed vendors. That explains why many government, research, and budget-constrained enterprises still build it into their toolchain.

Feature-In-Focus: Automated Vulnerability Scanning

It systematically scans networks, hosts, and services to detect known vulnerabilities, misconfigurations, and missing patches. It then produces detailed reports with severity levels and suggested remediation.

Pen testers can quickly and accurately find vulnerabilities, focus on high-risk targets, plan attacks, and give clear security recommendations. It also supports continuous assessment and compliance verification in complex environments.

Why do we recommend OpenVAS?

We recommend OpenVAS as a network penetration testing tool because it offers broad vulnerability coverage, flexibility, and integration capabilities at no cost. From working with and researching OpenVAS, what stood out to me is how well it performs in real-world use.

The vulnerability test feed is updated frequently, and you can easily customize scans as well, which makes it practical for compliance-driven environments. Indeed, it does not have the polish or commercial-grade support in the same way as Nessus, for example, but in my experience, it still delivers broad, repeatable vulnerability assessments at scale.

Who is OpenVAS recommended for?

OpenVAS is best suited for security teams, penetration testers, and organizations that need a robust vulnerability assessment and a budget-friendly alternative to commercial scanners.

It works well for SMBs or enterprises that can’t justify steep licensing costs, as well as government, research, and education sectors that value open-source transparency.

OpenVAS is offered in a free, open‑source Community edition that you can download and run on your own on‑premises systems (Windows/Linux/macOS via appliance) at no cost.

Greenbone also provides paid annual subscriptions for OPENVAS BASIC and OPENVAS SCAN. OPENVAS BASIC is priced at approximately €2,524 per year, and includes a 14-day free trial. Pricing for OPENVAS SCAN is provided via a custom quote on request.

6. Wireshark

Best For: Skilled teams who need visibility at the deepest level of the network stack

Price: Free and open-source

Wireshark is an open-source network protocol analyzer that captures and analyzes live traffic or saved packet traces in granular detail. Wireshark does not scan for vulnerabilities or directly exploit systems. It basically provides penetration testers with visibility into what’s actually happening on the wire, even down to individual packets, protocols, and payloads.

As a penetration testing tool, you can deploy Wireshark to analyze traffic patterns, identify cleartext credentials, detect insecure protocols, troubleshoot anomalies, and verify the success of ARP spoofing, man-in-the-middle injection, or other forms of attacks. You can also use it to confirm whether network defenses (firewalls, IDS/IPS, segmentation) are working as expected, or if sensitive data is leaking unencrypted.

In the penetration testing value chain, Wireshark serves as a validation and analysis tool. For instance, Nmap discovers hosts, Nessus/OpenVAS maps vulnerabilities, and Metasploit exploits them. However, Wireshark enables you to inspect the exact traffic flows to prove an exploit worked, confirm credentials or data exposure, validate MITM or ARP-spoofing results, and detect protocol misconfigurations or TLS downgrade issues that scanners miss.

However, it demands skilled analysts to interpret its results. Therefore, you need to be prepared to put in the work. But when used correctly, it provides irrefutable proof and deep context that no scanner can replace.

Wireshark Key Features:

• Command-line interface (TShark): Enables automation and integration into scripts or pipelines.
• Cross-platform Availability: It runs on Windows, Linux, macOS, BSD, Solaris, and others.
• Decryption Support: It can analyze encrypted protocols such as SSL/TLS and WPA/WPA2 when the correct keys are available.
• Packet Capture and Analysis: Records live or stored network traffic for deep inspection.
• Protocol Dissectors: Supports thousands of protocols, decoding them into human-readable fields.
• Display Filters: Enable precise packet queries to focus on specific hosts, services, or anomalies.

Unique Buying Proposition

Wireshark’s competitive advantage in the penetration testing space is its unmatched ability to see exactly what’s happening on the network at the packet level. Most tools, for example, tell you a port is open, a service is vulnerable, or an exploit succeeded. But Wireshark does way more than that.

It allows you to examine raw traffic to identify anomalies. It is one of the first tools I reach for when I need to demonstrate that a vulnerability isn’t just a CVE on paper but a real-world risk. Few other tools in the space give you that level of forensic clarity, and that’s what makes it unique.

Feature-In-Focus: Deep Packet Capture and Protocol Analysis

Wireshark’s deep packet capture and protocol analysis feature lets you inspect network traffic at the packet level in detail. It decodes hundreds of protocols so you can see how systems communicate in real time or from recorded captures. Penetration testers use it to expose unencrypted data, weak or misconfigured protocols, authentication flaws, and suspicious traffic patterns.

Why do we recommend Wireshark?

We recommend Wireshark because it provides penetration testers and defenders with deep visibility into live network traffic that no scanner or exploitation framework can match. In other words, Wireshark moves findings from “the scanner says so” to “here’s the packet capture that proves it.” That evidence is often what convinces leadership to take remediation seriously.

But the trade-off is that it requires expertise to interpret packet data and can generate overwhelming amounts of information on busy networks. While it is free to use, the real cost is the time and skill required to use it effectively.

Who is Wireshark recommended for?

Wireshark works best in controlled, monitored network environments where packet capture can be done safely and legally. It is recommended for skilled teams that need visibility into the deepest layers of the network stack.

Wireshark is completely free and open-source software that you can download and use. The version available from the official site is the full release with no feature limits or trial restrictions. It is released under the GNU General Public License version 2.

Wireshark can be run on your own machines across platforms such as Windows, macOS, Linux, and other Unix-like systems. Support is provided via community resources, mailing lists, documentation, and forums. However, some training and certification (separate from the software) may be available for a fee.

7. Cobalt Strike

Best For: Red teams, advanced penetration testers, purple team exercises, and security consultancies

Price: Not publicly listed

Cobalt Strike is a commercial adversary-emulation and post-exploitation platform used to simulate real-world attacks and validate defensive controls. It provides a managed command-and-control (C2) framework (the Beacon), payload delivery, lateral movement tools, privilege-escalation helpers, and collaboration features. Red teams use it to run realistic attack scenarios, maintain sessions, and gather impact evidence.

In the penetration-testing chain, it sits after discovery and vulnerability validation. Once you have an entry point (phishing, exploit, or validated vuln), Cobalt Strike is used to establish persistence, move laterally, escalate privileges, test detection and response, and demonstrate end-to-end business impact.

Cobalt Strike offers powerful adversary emulation capabilities, but it is commercial, expensive, and easily detected by modern EDRs without expert tuning. It requires experienced operators, strict authorization, strong OPSEC, and tightly controlled command-and-control infrastructure to use safely.

There are significant legal and ethical responsibilities, as misuse or weak governance can lead to operational damage or liability. Use it only in fully authorized engagements with trained staff, isolated infrastructure, proper logging, and cleanup procedures.

Cobalt Strike Key Features:

• Beacon C2 agent: Staged, flexible command-and-control with tasking, staging, and callbacks.
• Malleable C2: Customize network indicators to mimic legitimate traffic or different malware families.
• Post-exploitation toolset: Credential harvesting, lateral movement helpers, privilege escalation aids, and persistence primitives.
• Operational collaboration: Multi-operator team server, shared sessions, and coordinated playbooks.
• Social-engineering support: Built-in phishing and payload delivery workflows.
• Scripting & automation: Aggressor (scripting) for automating campaigns and reproducible scenarios.
• Reporting & training output: Engagement evidence and blue-team training artifacts.
• Enterprise packaging & support: Commercial product with vendor backing and integration options.

Unique Buying Proposition

Cobalt Strike’s real edge is full-spectrum adversary emulation. Its post-exploitation agent (the Beacon) and covert communication channels are designed to emulate long-term, stealthy intrusions, which is something most penetration testing tools don’t attempt. Operators can launch realistic phishing campaigns to gain entry, coordinate as a red team inside a live environment, and generate evidence-based reports tailored to blue team training.

Cobalt Strike is backed by Fortra, which gives it the credibility, ongoing development, and integration support that open-source red-team tools often lack. This backing ensures stability, professional support, and a place in a larger cybersecurity ecosystem.

Feature-In-Focus: Adversary Emulation and Command-and-Control (C2)

Cobalt Strike’s adversary emulation through command-and-control (C2) infrastructure centers on its Beacon payload and team server. Together, they model how real attackers establish persistence, communicate covertly, and operate inside a compromised environment over time. Testers can evaluate detection, response, and containment controls under conditions that closely resemble advanced threat behavior.

Why do we recommend Cobalt Strike?

We recommend Cobalt Strike because it delivers a complete, enterprise-ready adversary emulation platform. The software unifies exploitation and command-and-control into a single platform. These functions are what you find separately in Metasploit (exploitation) and Empire (command-and-control), for example.

Its Beacon agent provides post-exploit C2; Malleable C2 enables you to shape traffic for stealth; and built-in social-engineering and multi-operator features let teams run realistic, coordinated attack simulations.

Who is Cobalt Strike recommended for?

Cobalt Strike is suitable for red teams, advanced penetration testers, purple team exercises, and security consultancies that require end-to-end detection and response testing. Technically, you need an environment where you can host controlled C2 infrastructure (isolated cloud instances or air-gapped lab servers), capture telemetry (IDS/EDR/SIEM), and enforce strict rules of engagement to run and use it successfully.

Cobalt Strike does not list public pricing on its official site. Pricing and support entitlements vary based on the negotiated agreement and any additional services purchased. The software is licensed on a per-user, annual subscription basis. It is typically deployed on-premises or on infrastructure you control. There is no freely available full-feature version or permanent free tier. Prospective customers can request demos or trial discussions through the sales team.

Our Methodology for Choosing the Best Network Penetration Testing Tool

We assessed penetration testing tools across key criteria to ensure they effectively support your organization’s security testing efforts: Stakeholder Involvement: Decisions should include security leadership, compliance officers, procurement, and IT operations to ensure all requirements are met.

• Integration with Workflows: The value of a pen testing tool increases when it can push findings into SIEMs, open IT tickets, or generate compliance-ready reports for GRC platforms.
• Total Cost Consideration: The real cost includes not only licensing but also setup, training, maintenance, and ongoing staff time. Commercial tools may cost more upfront, but often save time and reduce operational burden.
• Compliance and Legal Considerations: Ensure the chosen tool meets regulatory requirements, is legal in your region, and does not create liability risks for your organization.
• Internal Expertise: Using open-source tools effectively requires skilled staff or third-party support to fill gaps in support, updates, and integration.
• Open-Source vs. Commercial: Open-source tools such as Nmap, Metasploit, and OpenVAS are widely used but often lack vendor accountability, SLAs, and long-term roadmaps. Commercial platforms offer dedicated support and enterprise-grade assurances but come at a higher cost.

Broader B2B Software Selection Methodology

We evaluate B2B software using a consistent, objective framework that focuses on how well a product solves meaningful business problems at a justified cost. This includes assessing overall performance, scalability, stability, and user experience quality. We examine real-world feedback from practitioners to understand how the software behaves outside of controlled demos.

We also review vendor transparency, roadmap clarity, support responsiveness, and the pace at which meaningful improvements are released. We follow this approach to ensure each of our recommendations is grounded in practical value, long-term viability, and operational impact, not in marketing claims.

Check out our detailed B2B software methodology page to learn more.

Why Trust Us?

Our work is produced by a team of IT and business software professionals with extensive hands-on experience evaluating, deploying, and managing enterprise technology. We analyze software independently, using evidence-based methods and industry best practices to ensure our assessments remain unbiased and technically sound.

Our goal is to provide you with clear, reliable insights that help reduce risk, shorten evaluation cycles, and support confident decision-making when selecting complex business technology.

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