A penetration test is a controlled, authorized attempt to break into your systems before a real attacker does. PCI DSS requires one, and insurers, auditors and large clients increasingly ask about them.
Pen testing comes up constantly in compliance conversations, usually as something a business suspects it needs without knowing what it involves. The process is less mysterious than it sounds, and a bit more involved than a quick scan. Here's what a pen test is, when it's required, when it's worth doing anyway and what you get at the end.
A penetration test (pen test) is a structured, authorized attempt by security professionals to exploit weaknesses in your systems, network or applications, using the same techniques real attackers use. The goal is to find the gaps, see how far an attacker could get through them, and document the results so they can be fixed.
It's different from a vulnerability scan. A scan checks for known weaknesses and reports them. A pen test tries to use those weaknesses, chain them together and show what an attacker could actually reach. Think of the scan as checking which windows are unlatched and the pen test as climbing through one to see what's inside.
External network test. What an attacker can reach and exploit from the internet: firewalls, VPN endpoints, web applications and email systems. This is the most common starting point.
Internal network test. What an attacker who is already inside (through a phishing email, a compromised vendor account or physical access) can reach. It reveals how easily someone could move between systems or gain administrator rights.
Web application test. A focused test of a web application or client portal for flaws such as injection, broken authentication and weak access controls.
Social engineering test. Simulated attacks aimed at people instead of systems, such as targeted phishing or pretext phone calls. It goes deeper than the routine phishing simulations in a security awareness training program.
PCI DSS v4.0.1. Requires external and internal penetration testing at least once a year and after significant changes, plus testing of segmentation controls if you use segmentation to reduce scope. This is a firm requirement for in-scope environments.
SOC 2. Doesn't require pen testing by name, but auditors often look for it as evidence that controls are tested, and clients reviewing your SOC 2 report may ask about it.
CMMC and NIST SP 800-171. NIST SP 800-171, which underpins CMMC Level 2, requires risk and security assessments and vulnerability scanning but doesn't specifically require penetration testing. Penetration testing does appear in the enhanced requirements for CMMC Level 3 (NIST SP 800-172).
Cyber insurance. Carriers increasingly ask about pen testing on applications, and some expect it for higher coverage levels. See What does your cyber insurance policy require?
SEC-registered advisers and broker-dealers. No SEC rule requires a pen test. Examiners may ask how you test your security controls and oversee vendors, and an independent pen test is one credible way to answer. Our IT for financial advisers and wealth managers page covers the wider picture.
HIPAA. Doesn't require pen testing by name. The Security Rule requires periodic technical and nontechnical evaluations of your safeguards, and a pen test is one way some organizations meet that.
A compliance risk assessment identifies and ranks risks in your environment. A pen test tries to exploit them. They answer different questions, and mature programs usually include both.
A professional pen test produces a written report with an executive summary for leadership, technical findings with severity ratings, evidence and recommended fixes, and a comparison with earlier tests where relevant. The report shows that testing happened, what was found and what you did about it.
The fixing matters as much as the testing. A report full of known, unaddressed findings puts you in a worse position than having no report, because it documents problems you knew about and left alone.
NerdSquad delivers penetration testing with a specialized penetration-testing partner. We scope the test around your regulatory and insurance obligations, coordinate the engagement, and then handle the fixes on the systems we manage. The report and the record of what was remediated become part of the evidence you can show auditors, examiners and insurers. For more on our security approach, see our cybersecurity services.
NerdSquad is not a law firm; confirm your obligations with your compliance counsel.
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