CVE-2020-26970

When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird < 78.5.1.

• CWE-787

• https://bugzilla.mozilla.org/show_bug.cgi?id=1677338Issue Tracking, Permissions Required, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-53/Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1677338Issue Tracking, Permissions Required, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-53/Vendor Advisory

Published

Dec 9, 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-2020-26965Some websites have a feature "Show Password" where clicking …6.5
• CVE-2020-26966Searching for a single word from the address bar caused an m…6.5
• CVE-2020-26967When listening for page changes with a Mutation Observer, a …6.5
• CVE-2020-26968Mozilla developers reported memory safety bugs present in Fi…8.8
• CVE-2020-26969Mozilla developers reported memory safety bugs present in Fi…8.8
• CVE-2020-2697Vulnerability in the Oracle Hospitality Suites Management co…4.9
• CVE-2020-26971Certain blit values provided by the user were not properly c…8.8
• CVE-2020-26972The lifecycle of IPC Actors allows managed actors to outlive…9.8
• CVE-2020-26973Certain input to the CSS Sanitizer confused it, resulting in…8.8
• CVE-2020-26974When flex-basis was used on a table wrapper, a StyleGenericF…8.8
• CVE-2020-26975When a malicious application installed on the user's device …6.5
• CVE-2020-26976When a HTTPS pages was embedded in a HTTP page, and there wa…6.5