Use-After-Free Vulnerability in Firefox WebRTC Audio/Video Component
CVE-2025-13020

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
11 November 2025

What is CVE-2025-13020?

A use-after-free vulnerability in the WebRTC Audio/Video component of Firefox enables attackers to potentially exploit memory corruption issues. This flaw affects several versions of Firefox, including all versions prior to 145 and Firefox ESR versions below 140.5. A successful exploitation may allow for arbitrary code execution, compromising the intended security model of the application.

Affected Version(s)

Firefox < 145

Firefox ESR < 140.5

Thunderbird < 145

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1995686
https://www.mozilla.org/security/advisories/mfsa2025-87/
https://www.mozilla.org/security/advisories/mfsa2025-88/

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Andreas Pehrson
JSON
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CVE-2025-13020 : Use-After-Free Vulnerability in Firefox WebRTC Audio/Video Component