KEV (CISA Known Exploited Vulnerabilities Catalog)
The CISA Known Exploited Vulnerabilities (KEV) Catalog is a living database maintained by the US Cybersecurity and Infrastructure Security Agency that lists CVEs for which CISA has obtained reliable evidence of active exploitation in the wild. It was established under Binding Operational Directive 22-01 (BOD 22-01), issued in November 2021, which requires all US Federal Civilian Executive Branch (FCEB) agencies to remediate KEV-listed vulnerabilities within prescribed timeframes — typically 2 weeks for critical vulnerabilities and up to 6 months for older ones. A vulnerability must meet three criteria to be added: it must have a CVE ID, there must be reliable evidence of exploitation in the wild (not just a proof-of-concept or theoretical risk), and there must be clear remediation guidance available. CISA accepts nominations from the public and adds vulnerabilities continuously; the catalog is available in CSV and JSON formats at a stable URL, making it machine-consumable for integration into vulnerability management platforms and asset inventory tools.