{"id":"CVE-2020-12420","details":"When trying to connect to a STUN server, a race condition could have caused a use-after-free of a pointer, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox ESR \u003c 68.10, Firefox \u003c 78, and Thunderbird \u003c 68.10.0.","modified":"2026-03-15T22:33:07.691642Z","published":"2020-07-09T15:15:11.973Z","related":["MGASA-2020-0274","MGASA-2020-0300","SUSE-SU-2020:14421-1","SUSE-SU-2020:1898-1","SUSE-SU-2020:1899-1","SUSE-SU-2020:1900-1","openSUSE-SU-2020:0967-1","openSUSE-SU-2020:0982-1","openSUSE-SU-2020:0983-1","openSUSE-SU-2020:1017-1","openSUSE-SU-2024:10600-1","openSUSE-SU-2024:10601-1","openSUSE-SU-2024:14572-1"],"references":[{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-24/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-25/"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202007-09"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202007-10"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4421-1/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-26/"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00023.html"},{"type":"ADVISORY","url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00026.html"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1643437"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-12420.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"78.0"}]},{"events":[{"introduced":"0"},{"fixed":"68.10.0"}]},{"events":[{"introduced":"0"},{"fixed":"68.10.0"}]},{"events":[{"introduced":"0"},{"last_affected":"16.04"}]},{"events":[{"introduced":"0"},{"last_affected":"18.04"}]},{"events":[{"introduced":"0"},{"last_affected":"19.10"}]},{"events":[{"introduced":"0"},{"last_affected":"20.04"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1"}]},{"events":[{"introduced":"0"},{"last_affected":"15.2"}]}]}}],"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"}]}