CVE-2021-38500

Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1725854%2C1728321Broken Link, Issue Tracking
• https://lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlMailing List, Third Party Advisory
• https://www.debian.org/security/2022/dsa-5034Issue Tracking, Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-43/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-44/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-45/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-46/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-47/Vendor Advisory
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1725854%2C1728321Broken Link, Issue Tracking
• https://lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlMailing List, Third Party Advisory
• https://www.debian.org/security/2022/dsa-5034Issue Tracking, Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-43/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-44/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-45/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-46/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-47/Vendor Advisory

Published

Nov 3, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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