{"id":"DEBIAN-CVE-2009-0021","details":"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.","modified":"2026-08-31T06:47:35.775143060Z","published":"2009-01-07T17:30:00.360Z","upstream":["CVE-2009-0021"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2009-0021"}],"affected":[{"package":{"name":"ntp","ecosystem":"Debian:11","purl":"pkg:deb/debian/ntp?arch=source&distro=bullseye"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:4.2.4p4+dfsg-8"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2009-0021.json"}}],"schema_version":"1.9.0"}