AWS and Cloudanix team co-authored this blog: Real-Time Threat and Anomaly Detection for Workloads on AWS

What Is EPSS?

EPSS estimates the probability that a software vulnerability will be exploited, helping teams prioritize remediation beyond CVSS alone.

EPSS stands for Exploit Prediction Scoring System. It estimates the likelihood that a software vulnerability will be exploited in the wild. Security teams use EPSS to prioritize vulnerability remediation when they cannot fix every finding immediately.

EPSS is useful because technical severity alone does not answer the most practical question: which vulnerability is most likely to be used by attackers soon?

EPSS vs CVSS

CVSS and EPSS measure different things.

CVSS describes the technical severity of a vulnerability: how easy it may be to exploit, what privileges are required, and what the possible impact could be.

EPSS estimates exploitation likelihood: how probable it is that attackers will exploit the vulnerability.

A vulnerability can have a high CVSS score but low EPSS. Another can have moderate CVSS but high EPSS. Risk-based programs look at both.

EPSS vs KEV

EPSS is predictive. KEV is evidence-based.

CISA KEV tells teams that a vulnerability is known to be exploited. EPSS estimates exploitation probability even before a vulnerability appears in KEV. Together, they create a stronger prioritization model.

Why EPSS needs asset context

EPSS does not know whether a vulnerable package exists in your production environment. It does not know whether the workload is internet reachable, connected to sensitive data, or isolated behind controls. That context must come from your cloud inventory, runtime data, network exposure, and ownership model.

For example, a high-EPSS vulnerability on an internet-facing production service should usually be handled faster than the same vulnerability in an internal test workload with no sensitive access.

How security teams use EPSS

Teams commonly use EPSS to:

  • Sort large vulnerability backlogs
  • Escalate likely-to-be-exploited vulnerabilities
  • Combine exploit probability with asset criticality
  • Inform patch windows and exception handling
  • Track risk movement over time

EPSS is not a replacement for judgment. It is a signal that helps teams make better decisions.

How Cloudanix helps

Cloudanix uses exploit intelligence signals such as EPSS alongside cloud graph context. The platform helps teams understand not only which CVEs are risky, but which vulnerable assets are exposed, reachable, tied to sensitive data, or part of an attack path.

Related pages include Zero-Day Watch, Vulnerability Prioritization, Cloud Inventory, and Attack Path.

Frequently asked questions

What does EPSS measure?

EPSS estimates the probability that a vulnerability will be exploited in the wild.

Is EPSS better than CVSS?

Neither is universally better. CVSS measures severity, while EPSS estimates likelihood. Use both with asset context.

Does high EPSS mean a vulnerability is already exploited?

Not necessarily. Known exploitation is better represented by sources such as CISA KEV.

How should teams use EPSS in cloud security?

Combine EPSS with exposure, asset criticality, owner, workload context, data sensitivity, and attack paths.

What Our Users Are Saying

Customer Reviews

Cloudanix is trusted by security leaders worldwide to deliver proactive, reliable, and cutting-edge cloud security.

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Ritesh Agarwal
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Pavan Kumar Lekkala
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Satish Mohan
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Satish Mohan
Co-founder & CTO, Airgap Networks

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Girish Manghnani
Managing Partner, Tech Inspira

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Nilesh Pethani
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Amol Naik
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Satish Mohan
Satish Mohan
CTO, Airgap Networks

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Okesh Badhiye
Head of Technical Engineering, Finfinity

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Jiten Gala
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Girish Manghnani
Managing Partner, Tech Inspira

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Sujit Karpe
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Akash Maheshwari
Co-founder, MoveInSync

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CTO, HugoHub

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Staff Security Engineer, Meesho

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Larry Wheat
Larry Wheat
Staff Solutions Engineer, Eversana

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