{"id":"CVE-2020-12387","details":"A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR \u003c 68.8, Firefox \u003c 76, and Thunderbird \u003c 68.8.0.","modified":"2026-03-15T22:32:28.434587Z","published":"2020-05-26T18:15:10.980Z","related":["MGASA-2020-0208","MGASA-2020-0209","SUSE-SU-2020:1209-1","SUSE-SU-2020:1218-1","SUSE-SU-2020:1225-1","SUSE-SU-2020:14359-1","openSUSE-SU-2020:0621-1","openSUSE-SU-2020:0643-1","openSUSE-SU-2024:10600-1","openSUSE-SU-2024:10601-1","openSUSE-SU-2024:14572-1"],"references":[{"type":"WEB","url":"https://usn.ubuntu.com/4373-1/"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202005-03"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202005-04"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-16/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-17/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-18/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1545345"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-12387.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"76.0"}]},{"events":[{"introduced":"0"},{"fixed":"68.8.0"}]},{"events":[{"introduced":"0"},{"fixed":"68.8.0"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}