CVE-2021-23982

Using techniques that built on the slipstream research, a malicious webpage could have scanned both an internal network's hosts as well as services running on the user's local machine utilizing WebRTC connections. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.

• CWE-326

• https://bugzilla.mozilla.org/show_bug.cgi?id=1677046Issue Tracking, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-10/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-11/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-12/Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1677046Issue Tracking, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-10/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-11/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2021-12/Vendor Advisory

Published

Mar 31, 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-2021-23977Firefox for Android suffered from a time-of-check-time-of-us…5.3
• CVE-2021-23978Mozilla developers reported memory safety bugs present in Fi…8.8
• CVE-2021-23979Mozilla developers reported memory safety bugs present in Fi…8.8
• CVE-2021-2398Vulnerability in the Oracle Advanced Outbound Telephony prod…8.1
• CVE-2021-23980A mutation XSS affects users calling bleach.clean with all o…6.1
• CVE-2021-23981A texture upload of a Pixel Buffer Object could have confuse…8.1
• CVE-2021-23983By causing a transition on a parent node by removing a CSS r…6.5
• CVE-2021-23984A malicious extension could have opened a popup window lacki…6.5
• CVE-2021-23985If an attacker is able to alter specific about:config values…6.5
• CVE-2021-23986A malicious extension with the 'search' permission could hav…6.5
• CVE-2021-23987Mozilla developers and community members reported memory saf…8.8
• CVE-2021-23988Mozilla developers reported memory safety bugs present in Fi…8.8