{"id":"CVE-2025-0239","details":"When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. This vulnerability affects Firefox \u003c 134, Firefox ESR \u003c 128.6, Thunderbird \u003c 134, and Thunderbird \u003c 128.6.","modified":"2026-03-15T22:49:59.825224Z","published":"2025-01-07T16:15:38.563Z","related":["ALSA-2025:0080","ALSA-2025:0144","CGA-vq45-64j7-h437","MGASA-2025-0009","MGASA-2025-0010","SUSE-SU-2025:0056-1","SUSE-SU-2025:0059-1","SUSE-SU-2025:0080-1","openSUSE-SU-2025:14619-1","openSUSE-SU-2025:14630-1","openSUSE-SU-2025:14648-1","openSUSE-SU-2025:14764-1"],"references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2025-02/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2025-04/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2025-05/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2025-01/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1929156"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"128.6.0"}]},{"events":[{"introduced":"0"},{"fixed":"134.0"}]},{"events":[{"introduced":"0"},{"fixed":"128.6.0"}]},{"events":[{"introduced":"129.0"},{"fixed":"134.0"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-0239.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}