Top 10 Best Internal Network Penetration Testing Providers in 2025

In a world of evolving threats, the security of an organization’s internal network is just as important as its external defenses.

An internal network penetration test simulates a real-world attack from a threat actor who has already gained a foothold inside the network, exposing vulnerabilities that could lead to privilege escalation and data exfiltration.

This guide highlights the top 10 internal network penetration testing service providers of 2025, chosen for their expertise, advanced methodologies, and actionable reporting.

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Why We Choose Internal Network Penetration Testing

The shift to remote work and cloud infrastructure has made the traditional network perimeter less defined. Modern attackers often use social engineering, phishing, or third-party vulnerabilities to bypass external defenses and gain initial access.

Once inside, they exploit internal weaknesses to move laterally, access sensitive data, and disrupt operations.

An internal penetration test provides a crucial “assume breach” perspective, identifying misconfigurations, weak access controls, and unpatched systems that could allow a minor incident to become a catastrophic breach.

How We Choose It

To identify the best providers, we assessed each company based on the following criteria:

Experience & Expertise (E-E): We prioritized firms with a proven history in offensive security, specifically in complex internal network environments.

The most effective providers have expert teams who can go beyond automated scans to find nuanced vulnerabilities.

Authoritativeness & Trustworthiness (A-T): We considered market reputation, industry accolades, and customer reviews. The quality and actionability of their final report were also critical factors.

Feature-Richness: We looked for services that offered:

Comprehensive Coverage: The ability to test a wide range of devices and infrastructure.

Advanced Techniques: The use of sophisticated tactics like post-exploitation, Active Directory attacks, and privilege escalation.

Actionable Reporting: A clear report that provides prioritized remediation guidance.

Continuous Testing: The availability of managed or continuous services for ongoing assurance.

Comparison of Key Features (2025)

Company	Manual Testing	Automated Scanning	Advanced Post-Exploitation	Actionable Reporting	Continuous Testing
UnderDefense	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
Secureworks	✅ Yes	✅ Yes	✅ Yes	✅ Yes	❌ No
Rapid7	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
NetSPI	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
Cobalt.io	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
Synack	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
AppSecure	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
Bishop Fox	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
ScienceSoft	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes
Astra	✅ Yes	✅ Yes	✅ Yes	✅ Yes	✅ Yes

1. UnderDefense

Internal network penetration testing — **UnderDefense**

UnderDefense is an offensive security provider known for its “beyond scanners” approach to penetration testing.

Their internal network testing service is designed to simulate a real attacker who has already gained a foothold inside your perimeter.

The team’s expertise in post-exploitation and lateral movement allows them to uncover critical vulnerabilities that automated tools often miss.

They deliver clear, actionable reports with practical remediation guidance.

Why You Want to Buy It:

UnderDefense’s commitment to human-led testing ensures they find nuanced vulnerabilities and attack paths that automated tools can’t detect.

Their clear reporting and remediation guidance simplify strengthening your internal network security.

Feature	Yes/No	Specification
Manual Testing	✅ Yes	Core focus is on human-led, hands-on testing.
Automated Scanning	✅ Yes	Uses scanners as a starting point, but manual testing is the core focus.
Advanced Attacks	✅ Yes	Simulates lateral movement, privilege escalation, and Active Directory attacks.
Actionable Reporting	✅ Yes	Provides a clear report with an executive summary and detailed remediation plans.
Continuous Testing	✅ Yes	Offers managed security services that include continuous testing.

✅ Best For: Organizations that need a hands-on, expert-led penetration test that goes beyond compliance and focuses on real-world business risks.

Try UnderDefense here → UnderDefense Official Website

2. Secureworks

Secureworks provides a robust penetration testing service backed by its industry-leading Counter Threat Unit (CTU) research team.

Their internal network penetration testing methodology is designed to identify real-world risks by leveraging intelligence on the latest attacker tactics.

Secureworks’ expert testers validate internal security controls, including network segmentation, access controls, and vulnerability management, for a comprehensive assessment.

Why You Want to Buy It:

By leveraging real-world threat intelligence from their CTU team, Secureworks’ tests are highly relevant and effective at uncovering vulnerabilities that could be exploited by modern adversaries.

Their reports are customized for both leadership and technical audiences.

Feature	Yes/No	Specification
Manual Testing	✅ Yes	Expert-led testing by seasoned security professionals.
Automated Scanning	✅ Yes	Utilizes a combination of proprietary and open-source tools.
Advanced Attacks	✅ Yes	Simulates attacks like privilege escalation and lateral movement.
Actionable Reporting	✅ Yes	Provides a clear course of action for both technical and executive audiences.
Continuous Testing	❌ No	Services are primarily point-in-time assessments.

✅ Best For: Enterprises looking for a trusted, experienced partner with a strong focus on a methodology that incorporates the latest threat intelligence.

Try Secureworks here → Secureworks Official Website

3. Rapid7

Rapid7 is a market leader in cybersecurity, offering a full suite of services and products.

Their internal network penetration testing service leverages a combination of proprietary tools and expert methodology to identify and exploit security weaknesses.

Rapid7’s approach goes beyond automated scans to provide a hands-on, expert-led assessment that identifies both technical vulnerabilities and the business risks they pose.

Why You Want to Buy It:

Rapid7’s expertise and deep understanding of the threat landscape, combined with their integrated platform, allow them to provide a holistic view of your security posture.

Their reports are highly detailed and provide an actionable remediation matrix.

Feature	Yes/No	Specification
Manual Testing	✅ Yes	Expert testers simulate real-world attacks.
Automated Scanning	✅ Yes	Utilizes their proprietary tools and public tools for reconnaissance.
Advanced Attacks	✅ Yes	Simulates attacks on Active Directory, privilege escalation, and lateral movement.
Actionable Reporting	✅ Yes	Provides a prioritized matrix with detailed remediation information.
Continuous Testing	✅ Yes	Services can be integrated into a continuous security program.

✅ Best For: Organizations already using Rapid7’s security products (e.g., InsightVM) who want a seamless, integrated approach to security testing and vulnerability management.

Try Rapid7 here → Rapid7 Official Website

4. NetSPI

NetSPI is a top-tier provider of penetration testing services, known for its scalable and technology-enabled approach.

Their internal network penetration testing methodology is part of their broader infrastructure testing services, and it leverages their proprietary Resolve platform to streamline the testing process and make findings actionable.

NetSPI’s expertise in large-scale testing makes them a leader in the enterprise space.

Why You Want to Buy It:

NetSPI’s Resolve platform provides a centralized, actionable view of all test findings, making it easy to track remediation progress over time.

Their long-standing reputation for quality and service is a major differentiator.

Feature	Yes/No	Specification
Manual Testing	✅ Yes	Expert-led testing with a focus on real-world attack scenarios.
Automated Scanning	✅ Yes	Uses proprietary tools for efficient scanning and vulnerability identification.
Advanced Attacks	✅ Yes	Simulates complex attacks, including privilege escalation and Active Directory exploitation.
Actionable Reporting	✅ Yes	Uses the Resolve platform for centralized, trackable reporting.
Continuous Testing	✅ Yes	Offers continuous penetration testing services for ongoing assurance.

✅ Best For: Large enterprises that need a partner capable of conducting high-volume, continuous penetration tests across a complex internal network environment.

Try NetSPI here → NetSPI Official Website

5. Cobalt.io

network penetration testing services — **Cobalt.io**

Cobalt.io is a pioneer in the Penetration Testing as a Service (PTaaS) model.

Their internal network penetration testing service combines the speed and scalability of a platform with the expertise of a vetted crowd of security professionals.

The platform provides real-time visibility into the testing process, allowing for seamless collaboration and rapid remediation.

Why You Want to Buy It:

Cobalt.io’s PTaaS platform streamlines the entire testing lifecycle, from scoping to reporting, with real-time feedback and direct communication with the testers.

Their credit-based pricing model offers great flexibility.

Feature	Yes/No	Specification
Manual Testing	✅ Yes	Conducted by a vetted community of expert testers.
Automated Scanning	✅ Yes	The platform uses automation to support human-led testing.
Advanced Attacks	✅ Yes	Simulates a wide range of attacks including Active Directory exploitation.
Actionable Reporting	✅ Yes	Real-time reporting on a user-friendly platform.
Continuous Testing	✅ Yes	The PTaaS model is designed for continuous, on-demand testing.

✅ Best For: Fast-moving organizations that need a flexible, on-demand, and transparent penetration testing service with a focus on continuous security.

Try Cobalt.io here → Cobalt.io Official Website

6. Synack

Synack’s Internal Network Testing as a Service (INTaaS) combines the power of its platform with the expertise of a global, vetted researcher community.

This PTaaS model provides a scalable and continuous approach to testing your internal network.

The platform offers real-time vulnerability management, while the researchers work to find and exploit complex vulnerabilities, providing a high level of security assurance.

Why You Want to Buy It:

Synack’s PTaaS model provides a high degree of flexibility and scalability, allowing you to launch tests quickly and get continuous coverage.

Their vetted community of researchers brings a diverse range of skills to every test.

Feature	Yes/No	Specification
Manual Testing	✅ Yes	Vetted security researchers (Synack Red Team) perform hands-on testing.
Automated Scanning	✅ Yes	The platform uses AI and automation to support human testing.
Advanced Attacks	✅ Yes	Researchers can chain exploits and use advanced tactics.
Actionable Reporting	✅ Yes	Results are delivered in real-time on the platform.
Continuous Testing	✅ Yes	The PTaaS model is designed for continuous, on-demand testing.

✅ Best For: Organizations that need a flexible, on-demand, and continuous testing solution for their internal networks with a focus on a diverse talent pool of researchers.

Try Synack here → Synack Official Website

7. AppSecure

top penetration testing companies 2025 — **AppSecure**

AppSecure is a cybersecurity firm that provides a comprehensive suite of offensive security services.

Their internal network penetration testing service is conducted by a team of ethical hackers who specialize in manual, human-led testing.

The service is designed to identify real-world vulnerabilities and provide clear, actionable remediation guidance.

AppSecure is known for its detailed reports and its ability to provide a personalized, high-quality service.

Why You Want to Buy It:

AppSecure’s commitment to manual testing and personalized service ensures a thorough assessment of your internal network security.

Their detailed reports provide the information you need to prioritize and fix vulnerabilities effectively.

Feature	Yes/No	Specification
Manual Testing	✅ Yes	A core focus on hands-on, manual penetration testing.
Automated Scanning	✅ Yes	Uses automated tools for reconnaissance, but manual testing is the core.
Advanced Attacks	✅ Yes	Simulates a wide range of attacks, including lateral movement and privilege escalation.
Actionable Reporting	✅ Yes	Provides a clear, detailed report with remediation recommendations.
Continuous Testing	✅ Yes	Offers managed security services that can include continuous testing.

✅ Best For: Companies looking for a hands-on, human-led penetration test with a focus on detailed, high-quality reporting and personalized service.

Try AppSecure here → AppSecure Official Website

8. Bishop Fox

Bishop Fox is a leading authority in offensive security, renowned for its deep technical expertise and innovative methodologies.

Their internal network penetration testing services are performed by seasoned professionals who employ the same cutting-edge tools and techniques as today’s most advanced adversaries.

They go beyond compliance to uncover hidden vulnerabilities and deliver actionable insights to strengthen your security posture.

Why You Want to Buy It:

Bishop Fox’s reputation for finding vulnerabilities others miss is unmatched.

Their team’s deep technical knowledge and ability to perform advanced, multi-vector attacks provide the highest level of assurance that your internal network is secure.

Feature	Yes/No	Specification
Manual Testing	✅ Yes	Human-led, in-depth testing by expert pentesters.
Automated Scanning	✅ Yes	Uses both proprietary and commercial tools for efficient reconnaissance.
Advanced Attacks	✅ Yes	Simulates lateral movement, Active Directory attacks, and privilege escalation.
Actionable Reporting	✅ Yes	Provides clear, executive-level summaries and detailed technical findings with remediation guidance.
Continuous Testing	✅ Yes	Their Cosmos platform provides continuous attack surface management and testing.

✅ Best For: Large enterprises and technology companies that require a highly experienced team to conduct a deep, comprehensive assessment of their internal network security posture.

Try Bishop Fox here → Bishop Fox Official Website

9. ScienceSoft

internal security audit — **ScienceSoft**

ScienceSoft provides a full suite of cybersecurity services, with a strong focus on internal network penetration testing.

Their service is designed to help organizations identify and mitigate vulnerabilities in their internal network environment.

ScienceSoft’s expert testers use a combination of automated and manual testing to uncover security weaknesses and provide a clear, actionable roadmap for remediation.

Why You Want to Buy It:

ScienceSoft’s deep expertise across multiple industries and their comprehensive methodology ensure a thorough and effective test.

They provide detailed reports with practical recommendations, making it easy to improve your security posture.

Feature	Yes/No	Specification
Manual Testing	✅ Yes	Uses manual testing to find vulnerabilities that automated tools miss.
Automated Scanning	✅ Yes	Utilizes both automated and manual techniques for a comprehensive assessment.
Advanced Attacks	✅ Yes	Tests for vulnerabilities in network segmentation, access controls, and Active Directory.
Actionable Reporting	✅ Yes	Provides detailed reports with remediation recommendations.
Continuous Testing	✅ Yes	Offers managed penetration testing for continuous security.

✅ Best For: Enterprises looking for a partner with extensive experience in a wide range of industries, including highly regulated sectors like finance and healthcare.

Try ScienceSoft here → ScienceSoft Official Website

10. Astra

Astra is a PTaaS provider that combines its intelligent vulnerability scanner with the expertise of a team of ethical hackers.

Their internal network penetration testing service is designed to be comprehensive and easy to use.

The platform provides a user-friendly dashboard for tracking vulnerabilities and managing the remediation process, making it ideal for organizations that want to streamline their security operations.

Why You Want to Buy It:

Astra’s combination of a powerful scanner and human expertise provides a high level of security at a predictable price.

The platform’s user-friendly dashboard and detailed reports simplify the entire testing process.

Feature	Yes/No	Specification
Manual Testing	✅ Yes	A team of ethical hackers performs manual testing.
Automated Scanning	✅ Yes	Uses an intelligent scanner that finds over 8,000 vulnerabilities.
Advanced Attacks	✅ Yes	Simulates lateral movement and privilege escalation attacks.
Actionable Reporting	✅ Yes	Provides a comprehensive dashboard with vulnerability details and remediation steps.
Continuous Testing	✅ Yes	The PTaaS model allows for continuous testing and monitoring.

✅ Best For: Companies of all sizes that want a simple, scalable, and continuous penetration testing solution with a user-friendly platform.

Try Astra here → Astra Official Website

Conclusion

In 2025, internal network penetration testing is a non-negotiable security practice. The right service provider can mean the difference between identifying a critical vulnerability and suffering a major breach.

The companies on this list represent the best in the industry, offering a blend of human-led expertise, advanced technology, and comprehensive reporting.

For organizations requiring a deep, expert-led engagement, Bishop Fox and UnderDefense are top-tier choices.

For those seeking the flexibility and continuous nature of a platform-driven approach, Synack and Cobalt.io offer leading PTaaS solutions.

For companies already integrated with a specific security platform, Rapid7 and Secureworks provide seamless, intelligence-backed services.

By evaluating your specific needs, budget, and desired level of engagement, you can select a partner from this list that will significantly enhance your internal security posture.