{"action":"Upgrade php7.4 to 7.4.21-1+deb11u1 or later.","affected":[{"fixed":"7.4.21-1+deb11u1","introduced":"0"}],"component":"php7.4","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:11","exploited":false,"fixed_versions":["7.4.21-1+deb11u1"],"id":"tcs_01M5NFDQMRWZW1YCZAKH582VDJ","modified_at":"2026-08-27T23:03:58.934538319Z","published_at":"2021-10-04T04:15:07.737Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-21704","https://security-tracker.debian.org/tracker/CVE-2021-21704"],"severity":{"label":"medium","score":5.9},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-21704","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-21704"}],"summary":"In PHP versions 7.3.x below 7.3.29, 7.4.x below 7.4.21 and 8.0.x below 8.0.8, when using Firebird PDO driver extension, a malicious database server could cause crashes in various database functions, s"}