{"id":"CVE-2021-29946","details":"Ports that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed port blocking restrictions when used in the Alt-Svc header. This vulnerability affects Firefox ESR \u003c 78.10, Thunderbird \u003c 78.10, and Firefox \u003c 88.","modified":"2026-04-16T04:36:42.517881997Z","published":"2021-06-24T14:15:09.797Z","related":["SUSE-SU-2021:1307-1","SUSE-SU-2021:1325-1","SUSE-SU-2021:1432-1","SUSE-SU-2021:1433-1","SUSE-SU-2021:14708-1","openSUSE-SU-2021:0621-1","openSUSE-SU-2021:0644-1","openSUSE-SU-2024:10600-1","openSUSE-SU-2024:10601-1","openSUSE-SU-2024:14572-1"],"references":[{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2021-14/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2021-15/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2021-16/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1698503"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"88.0"}]},{"events":[{"introduced":"0"},{"fixed":"78.10"}]},{"events":[{"introduced":"0"},{"fixed":"78.10"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-29946.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}