How Should I Prioritize Software Vulnerabilities?

The text discusses the challenges and methodologies in evaluating and prioritizing software vulnerabilities, emphasizing the need for effective risk management over complete eradication of vulnerabilities. It critiques the Common Vulnerability Scoring System (CVSS) for its limitations in accurately reflecting the severity and risk of vulnerabilities, noting its continued use despite these issues. The Known Exploited Vulnerabilities (KEV) catalog by CISA, though useful for identifying actively exploited vulnerabilities, is critiqued for its binary nature and lack of transparency. The Stakeholder-Specific Vulnerability Categorization (SSVC) offers a structured decision-making tool but faces challenges in vagueness and subjectivity. The Exploit Prediction Scoring System (EPSS) is highlighted as a promising approach for predicting the likelihood of exploitation, though it lacks customization and impact assessment. Reachability analysis is presented as an advanced method for prioritization by evaluating the real-world applicability of vulnerabilities in specific software contexts. The text concludes that a combination of these methodologies, excluding CVSS, can provide a clearer risk picture for security teams.

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