{"action":"Upgrade ntp to 1:4.2.4p4+dfsg-8 or later.","affected":[{"fixed":"1:4.2.4p4+dfsg-8","introduced":"0"}],"component":"ntp","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:11","exploited":false,"fixed_versions":["1:4.2.4p4+dfsg-8"],"id":"tcs_01M5N970HDKNMYQM1HEQ45MMH8","modified_at":"2026-08-31T06:47:35.775143060Z","published_at":"2009-01-07T17:30:00.360Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2009-0021","https://security-tracker.debian.org/tracker/CVE-2009-0021"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2009-0021","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2009-0021"}],"summary":"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 certif"}