Introduction

Penetration testing on systems and applications is a core expectation for any mature information security management system (ISMS). It directly supports ISO 27001:2022 Annex A 8.29, which requires security testing to be built into the development and acceptance of systems, and helps organisations prove the effectiveness of their technical controls in real-world attack scenarios.

What This Control Covers

In Comply Agent, the control “Penetration Testing on Systems and Applications” sits under the Security Assessment category with a subcategory of Vulnerability Management. The objective is to identify vulnerabilities in systems and applications and validate the effectiveness of security controls through structured, recurring penetration tests.

This aligns with ISO 27001 Annex A 8.29, which requires security testing in development and acceptance, and extends it to production environments. Typical in-scope assets include public-facing web applications, APIs, internal business systems, cloud workloads and critical network infrastructure.

Why Penetration Testing Matters for ISO 27001

While ISO 27001 does not explicitly say “you must perform penetration tests”, Annex A 8.29 expects organisations to have a systematic approach to security testing. Penetration testing is one of the most effective ways to:

• Identify exploitable vulnerabilities that automated scans may miss.
• Validate that existing security controls (WAFs, IAM, logging, monitoring) work as designed.
• Generate clear, risk-rated evidence for audits and management review.
• Support other requirements such as vulnerability management, secure development and supplier security.

Implementation & Guidance: Building a Penetration Testing Programme

The Implementation & Guidance section of the control in Comply Agent focuses on establishing a formal penetration testing programme with a defined scope, methodology and responsibilities. A practical implementation usually includes the following steps:

1. Define Scope and Objectives

• Identify high-risk systems such as login portals, payment pages, admin panels, APIs and remote access gateways.
• Decide whether the engagement is black-box, grey-box or white-box testing based on your risk appetite and available information.
• Align objectives with business drivers: ISO 27001 certification, PCI DSS, SOC 2, client requirements or internal risk findings.

2. Choose Methodologies and Standards

• Use recognised penetration testing standards such as OWASP Testing Guide, PTES, NIST SP 800-115, OSSTMM or CREST rules of engagement.
• For web and API testing, include OWASP Top 10 risks like injection, broken access control, authentication weaknesses, misconfigurations and insecure deserialisation.
• Document your chosen methodology in a Penetration Testing Policy and reference it from this control.

3. Integrate Testing into the SDLC

• Plan security testing for new systems before go-live as part of acceptance criteria.
• Trigger targeted tests after major releases, architectural changes or integration of new third-party services.
• Use results to refine secure coding standards, threat models and design reviews.

4. Use Qualified and Independent Testers

• For critical systems, engage internal teams that are organisationally independent of development, or reputable external providers.
• Look for testers with relevant certifications (e.g. OSCP, CREST, GIAC) and experience in your technology stack.
• Agree clear rules of engagement, communication channels and testing windows to avoid business disruption.

5. Reporting, Remediation and Retesting

• Ensure every engagement delivers a detailed report with risk ratings, exploit descriptions, screenshots or PoCs and practical remediation guidance.
• Log findings in your vulnerability management system, assign owners and set due dates based on risk.
• Schedule retesting to verify that critical and high findings are properly fixed before closure.

Operational Details in Comply Agent

In Comply Agent, Operational Details make the penetration testing process auditable. For this control you can configure:

• Frequency: Annually for critical systems, plus on-demand after major changes or incidents.
• Review cycle: Annual management review of the testing programme, reports and remediation performance.
• Owner and responsible role: Security Team or CISO as owner, working with system owners and external testers.
• Automation score: Use workflows to schedule tests, collect reports, track remediation tickets and send reminders.

This structure turns penetration testing from an ad-hoc activity into a repeatable security control with clear accountability.

Compliance, Risk Management and Framework Mapping

Within Comply Agent, the control is classified as a Technical control in the Vulnerability Management domain and mapped to ISO 27001:2022 Annex A 8.29 (Security testing in development and acceptance). You can also map it to other frameworks such as:

• PCI DSS requirements on internal and external penetration testing.
• SOC 2 CC-series controls for security assessments and vulnerability management.
• Sector-specific regulations that require regular security testing and validation of cyber resilience.

By centralising these mappings, one well-designed penetration testing programme can support multiple compliance obligations and reduce duplicate effort.

Evidence Library and Policy Templates

To be audit-ready, link this control to concrete evidence and policies in Comply Agent, such as:

• Penetration test plans and signed rules of engagement.
• Penetration test reports, including retest confirmations.
• Tickets or change records proving remediation of high-risk findings.
• Penetration Testing Policy and Vulnerability Management Policy.

These artefacts demonstrate the full lifecycle: planning, execution, remediation and continuous improvement, which is exactly what auditors look for when assessing Annex A 8.29.

FAQs: ISO 27001 Penetration Testing

Is penetration testing mandatory for ISO 27001 certification?

ISO 27001 does not explicitly state that penetration testing is mandatory, but it is widely used to satisfy Annex A 8.29 and related vulnerability management controls. Most certification auditors expect some form of structured penetration testing for higher-risk environments.

How often should penetration testing be conducted?

Critical systems are usually tested at least once per year, with additional tests after major changes, new deployments or significant incidents. The frequency should be risk-based and documented in your Penetration Testing Policy.

What is the difference between vulnerability scanning and penetration testing?

Vulnerability scanning uses automated tools to detect known issues across broad systems; penetration testing involves manual, creative exploitation to simulate real attacks and validate if vulnerabilities can actually be exploited.

What should be included in the scope of ISO 27001 penetration tests?

Scope should cover high‑risk assets in your ISMS, such as internet‑facing web apps, APIs, internal business systems, cloud infrastructure and remote access gateways.

Which standards should penetration testing follow for ISO 27001?

Use recognised methodologies like OWASP Testing Guide, PTES, NIST SP 800‑115, OSSTMM or CREST guidelines to ensure tests are thorough, repeatable and aligned with Annex A 8.29.

What evidence do auditors expect for ISO 27001 Annex A 8.29?

Auditors look for test plans, detailed reports with risk‑rated findings, remediation tracking, retest results and proof that security issues blocked or delayed production releases.