{"id":"CVE-2020-6820","details":"Under certain conditions, when handling a ReadableStream, 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 \u003c 68.7.0, Firefox \u003c 74.0.1, and Firefox ESR \u003c 68.6.1.","modified":"2026-04-16T04:40:18.744977530Z","published":"2020-04-24T16:15:13.463Z","related":["SUSE-SU-2020:0928-1","SUSE-SU-2020:0929-1","SUSE-SU-2020:1027-1","SUSE-SU-2020:14337-1","openSUSE-SU-2020:0461-1","openSUSE-SU-2020:0520-1","openSUSE-SU-2020:0544-1","openSUSE-SU-2024:10600-1","openSUSE-SU-2024:10601-1","openSUSE-SU-2024:14572-1"],"references":[{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6820"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4335-1/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-11/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-14/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1626728"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"68.6.1"}]},{"events":[{"introduced":"0"},{"fixed":"74.0.1"}]},{"events":[{"introduced":"0"},{"fixed":"68.7.0"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-6820.json"}}],"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"}]}