{"cve":"CVE-2009-0021","nvd":{"published":"2009-01-07T17:30:00.360","modified":"2026-06-16T23:04:05.973","status":"Modified","description":"NTP 4.2.4 before 4.2.4p5 and 4.2.5 before 4.2.5p150 does not properly check the return value from the OpenSSL EVP_VerifyFinal function, which allows remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature for DSA and ECDSA keys, a similar vulnerability to CVE-2008-5077.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-287"],"references":["http://lists.apple.com/archives/security-announce/2009/May/msg00002.html","http://lists.opensuse.org/opensuse-security-announce/2009-03/msg00000.html","http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00003.html","http://secunia.com/advisories/33406","http://secunia.com/advisories/33558"],"products":["ntp:ntp"],"source":"nvd","synced_at":"2026-10-19T19:53:23.791937413+00:00"},"epss":{"cve":"CVE-2009-0021","score":0.03218,"percentile":0.88214,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}