The Common Vulnerability Scanning System (CVSS) is the most frequently cited rating system to assess the severity of security vulnerabilities. It has been criticized, however, as not being appropriate to assess and prioritize risk from those vulnerabilities. For this reason, some have called for using the Exploit Prediction Scoring System (EPSS) or combining CVSS and EPSS to make vulnerability metrics more actionable and efficient. Like CVSS, EPSS is governed by the Forum of Incident Response and Security Teams (FIRST).
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