CVE-2021-38495

Mozilla developers reported memory safety bugs present in Thunderbird 78.13.0. 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 < 91.1 and Firefox ESR < 91.1.

• CWE-787

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1723391%2C1723920%2C1724101%2C1724107Vendor Advisory
• https://security.gentoo.org/glsa/202202-03Third Party Advisory
• https://security.gentoo.org/glsa/202208-14Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-40/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-41/Vendor Advisory
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1723391%2C1723920%2C1724101%2C1724107Vendor Advisory
• https://security.gentoo.org/glsa/202202-03Third Party Advisory
• https://security.gentoo.org/glsa/202208-14Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-40/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-41/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.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2021-3849An authentication bypass vulnerability was discovered in the…9.8
• CVE-2021-38490Altova MobileTogether Server before 7.3 SP1 allows XML expon…7.5
• CVE-2021-38491Mixed-content checks were unable to analyze opaque origins w…6.5
• CVE-2021-38492When delegating navigations to the operating system, Firefox…6.5
• CVE-2021-38493Mozilla developers reported memory safety bugs present in Fi…8.8
• CVE-2021-38494Mozilla developers reported memory safety bugs present in Fi…8.8
• CVE-2021-38496During operations on MessageTasks, a task may have been remo…8.8
• CVE-2021-38497Through use of reportValidity() and window.open(), a plain-t…6.5
• CVE-2021-38498During process shutdown, a document could have caused a use-…7.5
• CVE-2021-38499Mozilla developers reported memory safety bugs present in Fi…8.8
• CVE-2021-3850Authentication Bypass by Primary Weakness in GitHub reposito…9.1
• CVE-2021-38500Mozilla developers reported memory safety bugs present in Fi…8.8