Vulnerability management is one of the most fundamental — and most neglected — security practices. Here’s how to build a program that actually keeps your attack surface under control.
What Is Vulnerability Management?
Vulnerability management is the continuous process of identifying, classifying, prioritizing, and remediating security vulnerabilities in your systems and applications. It is distinct from a one-time penetration test — it’s an ongoing operational program, not a periodic assessment.
The Four Stages
Discover: Maintain a complete, current inventory of every asset in your environment. You can’t scan what you don’t know you have. Asset inventory is the foundation.
Assess: Regularly scan your assets for known vulnerabilities using automated vulnerability scanning tools (Tenable Nessus, Qualys, Rapid7). Scan frequency should match asset criticality — internet-facing assets weekly, internal assets monthly at minimum.
Prioritize: Not all vulnerabilities are equal. CVSS scores provide a base severity rating, but they don’t account for exploitability in your specific environment. Prioritize based on CVSS + whether public exploits exist + whether the asset is internet-facing + business criticality of the affected system.
Remediate: Patch, compensating control, or accept risk with documented justification. Track remediation through completion. Measure your mean time to remediate (MTTR) by severity tier.
The SLA Framework
Define remediation SLAs by severity: Critical vulnerabilities (CVSS 9.0+) within 24–48 hours. High (7.0–8.9) within 7 days. Medium (4.0–6.9) within 30 days. Low within 90 days. Hold your team accountable to these SLAs and report on compliance monthly.