{"id":"CVE-2020-6819","aliases":[],"url":"https://o3.security/vulnerability/CVE-2020-6819","summary":null,"details":"Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.","published":"2020-04-24T16:15:13.370Z","modified":"2026-04-16T04:37:44.689352097Z","cvss":{"score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.02965,"percentile":0.86336,"asOf":"2026-09-08"},"cisaKev":null,"exploitsKnown":4,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6819"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-11/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-14/"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4335-1/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1620818"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-04-16T04:37:44.689352097Z"}}