How Often Should Your Enterprise Run Penetration Tests?

MSInfo RedTeam

MSInfo Services

February 5, 20255 min read

Annual penetration testing is the industry standard — but is it actually sufficient? The answer depends on how fast your attack surface changes.

Annual penetration testing has become the industry standard, embedded in frameworks like ISO 27001, PCI DSS, and the RBI cybersecurity guidelines for banks. But the assumption underlying annual testing — that your attack surface is relatively static and a point-in-time assessment remains valid for 12 months — is increasingly difficult to justify in today's development environments.

Modern enterprises deploy code multiple times per day. Cloud infrastructure is provisioned and modified continuously through infrastructure-as-code pipelines. New SaaS applications are onboarded by business units without always informing security teams. Third-party integrations and APIs expand the attack surface with every new connection. In this environment, a penetration test conducted in January may not reflect the attack surface that exists in June.

The right frequency of penetration testing depends on the pace of change in your environment. A stable, slow-changing environment with a small technology footprint might genuinely be well-served by annual testing. A fast-moving SaaS company deploying code daily, onboarding new integrations weekly, and expanding into new markets regularly needs a fundamentally different approach.

Penetration Testing as a Service (PTaaS) has emerged as a response to this challenge. PTaaS provides continuous or high-frequency testing through a combination of automated scanning, continuous asset discovery, and on-demand manual penetration testing for specific changes or releases. This approach keeps security assurance in step with the pace of development.

For organizations subject to regulatory requirements specifying annual penetration testing, PTaaS provides the regulatory baseline while also delivering the more frequent testing that the actual risk profile demands.

Beyond frequency, scope matters. Many organizations test the same set of systems year after year, while new assets — cloud infrastructure, internal applications, APIs — remain untested. A comprehensive penetration testing program requires continuous asset inventory management to ensure that nothing falls outside the testing scope.