CVE-2021-23965

Mozilla developers reported memory safety bugs present in Firefox 84. 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 Firefox < 85.

• CWE-787

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1670378%2C1673555%2C1676812%2C1678582%2C1684497Exploit, Issue Tracking, Patch, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-03/Release Notes, Vendor Advisory
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1670378%2C1673555%2C1676812%2C1678582%2C1684497Exploit, Issue Tracking, Patch, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-03/Release Notes, Vendor Advisory

Published

Feb 26, 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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