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BackWhat is Exploit Prediction Scoring System (EPSS)?
Exploit Prediction Scoring System (EPSS) is a data-driven framework that estimates the likelihood of a software vulnerability being exploited in the wild within the next 30 days. Developed by the Forum of Incident Response and Security Teams (FIRST), it helps security teams prioritize remediation efforts based on real-world exploitation probability rather than severity alone.
Why EPSS Matters
Organizations often struggle with vulnerability overload. Thousands of Common Vulnerabilities and Exposures (CVEs) receive scores through the Common Vulnerability Scoring System (CVSS), yet only a fraction are actively exploited. As a result, patching solely based on severity can divert resources away from genuinely risky threats.
EPSS addresses this challenge by assigning each vulnerability a probability score ranging from 0 to 1 (or 0% to 100%). Consequently, security teams can focus on vulnerabilities that attackers are more likely to exploit, improving risk-based vulnerability management.
EPSS vs. CVSS
Although both frameworks evaluate vulnerabilities, they serve different purposes.
| Feature | EPSS | CVSS |
|---|---|---|
| Primary focus | Likelihood of exploitation | Technical severity |
| Score range | 0–1 (probability) | 0–10 (severity) |
| Based on | Threat intelligence and exploitation data | Vulnerability characteristics |
| Answers | “Will it likely be exploited?” | “How severe is it?” |
| Best use case | Prioritizing remediation | Assessing impact |
Therefore, many security teams use both metrics together. A vulnerability with a moderate CVSS score but a high EPSS score may require more urgent attention than a severe vulnerability with little evidence of likely exploitation.
How Organizations Use EPSS
Security operations teams integrate Exploit Prediction Scoring System (EPSS) into vulnerability management workflows to prioritize patching, reduce remediation backlogs, and allocate resources more effectively. Furthermore, EPSS supports risk-based decision-making by highlighting vulnerabilities that pose a higher likelihood of near-term exploitation.
In enterprise environments, endpoint management and security platforms can complement vulnerability prioritization efforts by helping IT teams maintain visibility, deploy patches, and enforce security policies across managed devices. In this context, solutions such as Hexnode UEM can support broader vulnerability management strategies by streamlining endpoint security operations.
FAQs
No. EPSS provides a predictive score, whereas threat intelligence offers broader context about attacker activity, campaigns, and emerging risks. Organizations typically use both to strengthen prioritization.
EPSS scores are updated daily. This frequent refresh allows organizations to respond to changes in exploitation trends and emerging threat activity.
Yes. By identifying vulnerabilities with a higher probability of exploitation, EPSS helps teams focus remediation efforts on the issues that present the most immediate risk.
While EPSS is not a compliance framework, it can support risk-based vulnerability management programs and help organizations justify remediation priorities during audits and security reviews.