What the CISA KEV Catalog Is
A CISA-maintained catalog of CVEs with confirmed evidence of active, in-the-wild exploitation — not a predictive or theoretical list.
Why It Matters
KEV listing is the strongest publicly available signal that a vulnerability is not theoretical — it means CISA has confirmed real-world exploitation is already happening, which is a materially different situation than "could theoretically be exploited."
Application to Application Security
Relevant wherever a dependency or platform vulnerability appears on the KEV catalog — that CVE should generally jump ahead of same-severity, non-KEV findings in a remediation queue regardless of what CVSS alone would suggest.
Relation to Software Development
For engineering teams, KEV listing is a prioritization signal to consume in a vulnerability-management process, not something an application implements directly.
How Strata Surfaces This
This page is an educational overview of how the catalog works, not a live mirror of its contents — check CISA's own catalog directly for current entries when making a remediation decision.
Developer guidance
When a dependency CVE appears on the KEV catalog, treat it as a priority override regardless of its CVSS score — active exploitation evidence outweighs a generic severity estimate.
Management guidance
KEV listing is a strong, externally-defensible justification for reprioritizing a remediation queue on short notice — useful when you need to explain an unplanned priority shift.