Penetration Testing for SOC 2, PCI DSS v4 and CMMC: What Is Required

Penetration testing has evolved from a nice-to-have security practice into a non-negotiable requirement across major compliance frameworks. Whether your organization pursues SOC 2 Type II certification, PCI DSS v4 validation, or CMMC Level 2+ authorization, penetration testing compliance requirements are now front and center. Understanding what each framework demands—and how to meet those demands efficiently—is essential for 2026 and beyond.

Why Penetration Testing Matters for Compliance

Penetration testing simulates real-world attacks to identify vulnerabilities before threat actors do. Compliance frameworks recognize that preventive controls alone are insufficient; active testing proves that your defenses actually work. Regulators, auditors, and customers increasingly view penetration testing as evidence of mature security posture and commitment to protecting sensitive data.

Beyond checkbox compliance, penetration testing delivers business value: it uncovers exploitable weaknesses in applications, infrastructure, and human processes. For organizations handling payment card data, healthcare records, or classified information, the investment in testing is often far less costly than the aftermath of a breach.

SOC 2 Type II and Penetration Testing

SOC 2 Type II audits assess your organization's controls over security, availability, processing integrity, confidentiality, and privacy. The Trust Service Criteria (TSC) don't mandate penetration testing by name, but they require testing of logical and physical access controls, change management, and incident detection.

What SOC 2 Auditors Expect

• Testing scope: Application security, network penetration testing, and social engineering assessments covering user access, authentication, and authorization controls
• Frequency: At minimum, annual testing; some auditors recommend bi-annual testing for higher-risk environments
• Documentation: Written penetration test reports, remediation tracking, and evidence that critical and high-severity findings were addressed before the audit period ends
• Qualified testers: SOC 2 auditors (issued by licensed CPA firms) expect tests performed by experienced security professionals with relevant certifications (OSCP, CEH, GPEN, or equivalent)

A common misconception is that SOC 2 requires third-party penetration testing. While not explicitly mandated, independent testing is strongly preferred by auditors because it demonstrates objective validation and reduces bias. Your auditor will determine acceptability; relying solely on internal testing often raises questions about independence and rigor.

PCI DSS v4.0 Penetration Testing Requirements

PCI DSS v4.0 (in effect since January 2024) significantly strengthened penetration testing mandates. These requirements are non-negotiable for any entity storing, processing, or transmitting payment card data.

PCI DSS v4 Testing Mandates

• Requirement 11.3.1: External penetration testing at least annually and after any significant infrastructure changes. Internal testing required at least semi-annually and after significant changes.
• Requirement 11.3.2: Network segmentation testing to verify isolation of cardholder data environment (CDE) from other systems
• Requirement 6.3.1: Application testing for common vulnerabilities (OWASP Top 10 and similar) before deployment to production
• Qualified Assessor requirement: External penetration testing must be performed by a Qualified Security Assessor (QSA) or Qualified Penetration Tester (approved by the PCI Council). Praxis-Q partners with CyberSigma (our QSA provider) to connect clients with approved testers.

A critical update in v4.0 is the emphasis on proof-of-compromise for critical vulnerabilities. Testers must not only identify weaknesses but demonstrate actual exploitation to confirm risk. This shift from theoretical to practical validation sets a higher bar than previous versions.

Scope Considerations for PCI DSS v4

Your penetration test must cover all systems connected to or supporting the CDE, including payment applications, databases, web servers, and access control systems. Network perimeter testing, wireless testing, and social engineering are typically included. Budget 3–6 months for planning, execution, remediation, and re-testing in complex environments.

CMMC Penetration Testing Requirements

The Cybersecurity Maturity Model Certification (CMMC) 2.0, now integrated into U.S. Department of Defense procurement requirements, mandates penetration testing at both assessed and awarded levels.

CMMC Level Penetration Testing Breakdown

• CMMC Level 1: No formal penetration testing required; relies on self-assessment and limited automated scanning
• CMMC Level 2: Annual penetration testing by an accredited Certified CMMC Professional (C3PAO). Testing must include external network penetration, internal network testing, and controlled environment testing (lab-based wireless, physical, supply chain scenarios)
• CMMC Level 3: Annual testing with more rigorous scope, plus continuous monitoring and threat-informed testing strategies

A key CMMC requirement is that penetration testing addresses the NIST SP 800-171 security controls mapped to each level. Unlike PCI DSS, CMMC testing is always third-party—conducted by accredited C3PAOs during the official assessment. You cannot satisfy CMMC assessment requirements with internal testing alone.

CMMC-Specific Testing Nuances

• Testing must follow the CMMC Assessment Scope Statement (ASS), clearly defining what systems fall within unclassified controlled technical information (UCTI) and controlled unclassified information (CUI) scope
• Testers evaluate whether your organization detects and responds to simulated attacks (detection and response controls, not just prevention)
• Supply chain risk and third-party testing may be included depending on your operational context

Comparing Frequency and Scope Across Frameworks

Building Your Penetration Testing Program

Whether pursuing one or multiple compliance certifications, an integrated approach maximizes efficiency and reduces costs. Consider the following best practices:

• Coordinate timing: Schedule penetration tests to align with audit periods where possible, allowing one engagement to support multiple compliance assertions
• Define scope clearly: Document systems, applications, and user populations included in testing to avoid scope creep or incomplete coverage
• Establish remediation workflows: Before testing begins, agree on timelines for fixing critical and high-severity issues. Many compliance auditors require evidence that critical findings were remediated within 30 days
• Plan for re-testing: Budget time and resources for re-testing after remediation. Some frameworks (PCI DSS v4 especially) mandate confirmation that vulnerabilities were actually fixed
• Use results for continuous improvement: Penetration test findings should inform your security roadmap, training priorities, and process improvements beyond compliance checkbox items

Frequently Asked Questions

Can one penetration test satisfy multiple compliance frameworks simultaneously?

Partially. A single engagement can address overlapping requirements, but each framework has specific testing scope and validation criteria. For example, a PCI DSS v4 test must include proof-of-compromise and network segmentation validation, while SOC 2 testing focuses on access controls and detection mechanisms. Coordinate with your QSA, auditor, or C3PAO before the test to confirm scope covers all applicable frameworks. Praxis-Q helps clients design testing programs that efficiently address multiple compliance mandates.

What's the difference between penetration testing and vulnerability scanning?

Vulnerability scanning is automated and identifies known weaknesses in systems, applications, and configurations. Penetration testing is manual, hands-on work where skilled testers exploit vulnerabilities to demonstrate real-world risk and chain multiple weaknesses into attack paths. Compliance frameworks require both: scanning provides broad coverage; penetration testing validates that threats are genuinely preventable. SOC 2, PCI DSS v4, and CMMC all require actual penetration testing, not scanning alone.

Do we need internal penetration testing if we hire a third-party tester?

Yes, for PCI DSS v4 and CMMC Level 2. PCI DSS v4 explicitly requires both annual external and semi-annual internal testing. CMMC annual assessments include internal and external components performed by the C3PAO. SOC 2 doesn't mandate third-party testing, but most auditors expect it. Internal testing fills the gaps between third-party engagements and accelerates issue identification and remediation throughout the year.

Next Steps: Building Your Compliance Foundation

Penetration testing compliance is not a one-time box to check—it's a foundational element of security maturity that evolves with your organization and threat landscape. Whether you're preparing for SOC 2, PCI DSS v4, CMMC, or a combination, the investment in rigorous, qualified penetration testing demonstrates genuine commitment to protecting customer and company data.

Praxis-Q works with organizations to design testing programs, coordinate with qualified assessors and C3PAOs, and translate findings into actionable security improvements. Contact our team to discuss your penetration testing strategy and compliance timeline.