CVE-2020-15659

Mozilla developers and community members reported memory safety bugs present in Firefox 78 and Firefox ESR 78.0. 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 Firefox < 79, Firefox ESR < 68.11, Firefox ESR < 78.1, Thunderbird < 68.11, and Thunderbird < 78.1.

• CWE-787

• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00022.htmlMailing List, Patch, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.htmlMailing List, Patch, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00032.htmlMailing List, Patch, Third Party Advisory
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1550133%2C1633880%2C1643613%2C1644839%2C1645835%2C1646006%2C1646787%2C1649347%2C1650811%2C1651678Issue Tracking, Permissions Required, Vendor Advisory
• https://usn.ubuntu.com/4443-1/Patch, Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-30/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-31/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-32/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-33/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-35/Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00022.htmlMailing List, Patch, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.htmlMailing List, Patch, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00032.htmlMailing List, Patch, Third Party Advisory
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1550133%2C1633880%2C1643613%2C1644839%2C1645835%2C1646006%2C1646787%2C1649347%2C1650811%2C1651678Issue Tracking, Permissions Required, Vendor Advisory
• https://usn.ubuntu.com/4443-1/Patch, Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-30/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-31/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-32/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-33/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-35/Vendor Advisory

Published

Aug 10, 2020

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-2020-15653An iframe sandbox element with the allow-popups flag could b…6.5
• CVE-2020-15654When in an endless loop, a website specifying a custom curso…6.5
• CVE-2020-15655A redirected HTTP request which is observed or modified thro…6.5
• CVE-2020-15656JIT optimizations involving the Javascript arguments object …8.8
• CVE-2020-15657Firefox could be made to load attacker-supplied DLL files fr…7.8
• CVE-2020-15658The code for downloading files did not properly take care of…6.5
• CVE-2020-1566An elevation of privilege vulnerability exists when the Wind…4.2
• CVE-2020-15660Missing checks on Content-Type headers in geckodriver before…8.8
• CVE-2020-15661A rogue webpage could override the injected WKUserScript use…6.5
• CVE-2020-15662A rogue webpage could override the injected WKUserScript use…6.5
• CVE-2020-15663If Firefox is installed to a user-writable directory, the Mo…8.8
• CVE-2020-15664By holding a reference to the eval() function from an about:…6.5