What is Penetration Testing?

Penetration testing provides the most realistic assessment of an organization's security posture by simulating the tactics, techniques, and procedures (TTPs) that real attackers use. Tests can be categorized by scope (network, web application, mobile, API, social engineering, physical), knowledge level (black box with no prior knowledge, white box with full access to source code, or grey box with partial information), and perspective (external targeting internet-facing assets or internal simulating an insider threat). A typical engagement includes planning and scoping, reconnaissance and enumeration, vulnerability identification, exploitation and pivoting, post-exploitation analysis, and detailed reporting with remediation recommendations. SOC 2 auditors frequently ask for evidence of annual penetration testing and review how findings were remediated. ISO 27001 references technical compliance reviews including penetration testing. PCI DSS mandates annual penetration testing with specific requirements. Organizations should select testing firms that hold relevant certifications (CREST, OSCP) and ensure clear rules of engagement before testing begins.