A penetration test is exactly what it sounds like: a controlled attempt to break into your systems before an attacker does. Here’s when it’s required, when it’s optional but worth it, and what it actually involves.
Penetration testing shows up in compliance conversations constantly — usually as something organizations know they’re supposed to have but aren’t sure they need, or think they need but aren’t sure what it involves. It’s neither as exotic as it sounds nor as simple as vendors sometimes make it seem. Here’s the plain-English version.
A penetration test (pen test) is a structured, authorized attempt to exploit vulnerabilities in your systems, networks, or applications — conducted by security professionals using the same techniques real attackers use. The goal is to find vulnerabilities before attackers do, understand how far an attacker could get if they exploited them, and produce documentation that supports remediation and compliance.
It’s different from a vulnerability scan, which identifies known vulnerabilities but doesn’t attempt to exploit them. A vulnerability scan tells you where the doors are unlocked. A pen test tries to walk through them, see how far it gets, and document what it found inside.
External network penetration test. Tests what an attacker can reach and exploit from the internet — your external-facing systems, firewalls, VPN endpoints, web applications, and email infrastructure. This is the most common type and typically the starting point for most businesses.
Internal network penetration test. Tests what an attacker who is already inside your network — through a phishing attack, a compromised vendor account, or physical access — can reach and do. Reveals lateral movement risks, privilege escalation paths, and how far an insider threat could get.
Web application penetration test. Specifically tests a web application or client portal for vulnerabilities — SQL injection, authentication flaws, access control issues, session management weaknesses. Required under PCI-DSS for organizations with internet-facing payment systems.
Social engineering / phishing penetration test. Structured attack simulations targeting your people rather than your systems. Overlaps with security awareness training programs but goes deeper — testing whether employees would provide credentials, allow physical access, or execute malicious attachments under realistic pretexts.
PCI-DSS requires external and internal penetration testing at least annually and after any significant infrastructure or application upgrade. This is a hard requirement — not optional for in-scope environments.
SOC 2 doesn’t explicitly require penetration testing, but auditors increasingly expect it as evidence of the organization’s security posture. Larger enterprise clients requesting SOC 2 reports often ask about pen test frequency and findings.
CMMC / NIST 800-171 requires organizations handling controlled unclassified information to conduct penetration testing as part of the risk management program.
Cyber insurance carriers are increasingly asking about penetration testing on renewal applications. Some require annual testing for higher-tier policies. Many use the presence or absence of regular pen testing as a pricing factor.
SEC cybersecurity rules don’t require penetration testing specifically, but the obligation to maintain and document a cybersecurity risk management program is increasingly interpreted to include it for firms with significant technology exposure.
HIPAA doesn’t require penetration testing by name, but the Security Rule’s requirement for technical and non-technical evaluations of the security environment is commonly implemented through pen testing as a best practice and OCR expectation.
Even when not explicitly mandated, penetration testing is worth the investment when: you’ve made significant changes to your infrastructure or added new applications; you’re onboarding an enterprise client that will ask about your security posture; you’re preparing for a merger, acquisition, or due diligence process; you want independent validation that your security controls actually work as designed; or you’ve had a security incident and want to verify the remediation was complete.
The distinction that matters: a compliance risk assessment identifies and scores risks based on your environment. A penetration test attempts to exploit them. They answer different questions and produce different evidence. Mature compliance programs typically include both.
A professional penetration test produces a written report that includes: an executive summary (appropriate for leadership and board-level review), a technical findings section with each vulnerability, its severity, the evidence of exploitation, and remediation recommendations, and a comparison to the previous test if applicable. The report is a compliance artifact — it demonstrates that testing occurred, what was found, and what was done about it.
The remediation phase matters as much as the test itself. A pen test report that sits in a drawer without remediation is worse than no test — it documents vulnerabilities an organization knew about and didn’t fix, which is a difficult position in an enforcement action or litigation.
NerdSquad coordinates penetration testing for managed IT clients — through our own assessments and through vetted third-party specialists for scope that requires independent validation. We scope the engagement appropriately for the client’s regulatory obligations, support remediation of findings, and maintain the documentation as part of the ongoing compliance program.
For regulated clients, pen test results are part of the evidence package for audits and cyber insurance renewals. For clients without a specific mandate, we use pen test findings to identify gaps that vulnerability scanning and risk assessments miss.
For the broader compliance program context, see What is a compliance risk assessment? and What is digital compliance?