CVE-2020-6806

By carefully crafting promise resolutions, it was possible to cause an out-of-bounds read off the end of an array resized during script execution. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.

• CWE-125

• http://packetstormsecurity.com/files/157524/Firefox-js-ReadableStreamCloseInternal-Out-Of-Bounds-Access.htmlThird Party Advisory, VDB Entry
• https://bugzilla.mozilla.org/show_bug.cgi?id=1612308Issue Tracking, Permissions Required
• https://usn.ubuntu.com/4328-1/Third Party Advisory
• https://usn.ubuntu.com/4335-1/Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-08/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-09/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-10/Vendor Advisory
• http://packetstormsecurity.com/files/157524/Firefox-js-ReadableStreamCloseInternal-Out-Of-Bounds-Access.htmlThird Party Advisory, VDB Entry
• https://bugzilla.mozilla.org/show_bug.cgi?id=1612308Issue Tracking, Permissions Required
• https://usn.ubuntu.com/4328-1/Third Party Advisory
• https://usn.ubuntu.com/4335-1/Third Party Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-08/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-09/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-10/Vendor Advisory

Published

Mar 25, 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-2020-6800Mozilla developers and community members reported memory saf…8.8
• CVE-2020-6801Mozilla developers reported memory safety bugs present in Fi…8.8
• CVE-2020-6802In Mozilla Bleach before 3.11, a mutation XSS affects users …6.1
• CVE-2020-6803An open redirect is present on the gateway's login page, whi…6.1
• CVE-2020-6804A reflected XSS vulnerability exists within the gateway, all…6.1
• CVE-2020-6805When removing data about an origin whose tab was recently cl…8.8
• CVE-2020-6807When a device was changed while a stream was about to be des…8.8
• CVE-2020-6808When a JavaScript URL (javascript:) is evaluated and the res…6.5
• CVE-2020-6809When a Web Extension had the all-urls permission and made a …7.5
• CVE-2020-6810After a website had entered fullscreen mode, it could have u…4.3
• CVE-2020-6811The 'Copy as cURL' feature of Devtools' network tab did not …8.8
• CVE-2020-6812The first time AirPods are connected to an iPhone, they beco…5.3