Combining EPSS and Reachability Analysis to Optimize Vulnerability Management

Exploiting past vulnerabilities is a critical factor in predicting future security risks, and the Exploit Prediction Scoring System (EPSS) offers a tool for assessing the likelihood of exploitation for published Common Vulnerabilities and Exposures (CVEs). Managed by the Forum of Incident Response and Security Teams (FIRST), the EPSS uses diverse data sources, including live exploitation data from vendors like Fortiguard and GreyNoise, public mentions of vulnerabilities, exploit code availability, and social media discussions, to provide a probabilistic score for predicting CVE exploitation within 30 days. Unlike the Common Vulnerability Scoring System (CVSS), which provides a static score, the EPSS offers a dynamic, data-driven approach to vulnerability management by integrating real-world activity, thus allowing organizations to prioritize vulnerabilities more effectively. While the EPSS is not a complete solution due to its lack of environment-specific context, it becomes more powerful when combined with reachability analysis, enabling the identification of vulnerabilities that are both reachable and likely to be exploited. By focusing on a smaller subset of high-risk CVEs, organizations can significantly reduce their remediation workload compared to using traditional CVSS methods.

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