CVE-2025-14321

CRITICAL

WebRTC: Signaling - Use After Free

Title source: llm

Description

Use-after-free in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Exploits (1)

nomisec WORKING POC 2 stars

by h3raklez · poc

https://github.com/h3raklez/CVE-2025-14321

View Code ZIP pw:eip

References (5)

[Issue Tracking, Permissions Required] https://bugzilla.mozilla.org/show_bug.cgi?id=1992760

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-92/

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-94/

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-95/

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-96/

Scores

CVSS v3 9.8

EPSS 0.0009

EPSS Percentile 24.8%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE

CWE-416

Status published

Products (8)

mozilla/firefox < 140.6.0

mozilla/firefox < 146.0

Mozilla/Firefox 140.6 - 140.*

Mozilla/Firefox 146

mozilla/thunderbird < 140.6.0

mozilla/thunderbird < 146.0

Mozilla/Thunderbird 140.6 - 140.*

Mozilla/Thunderbird 146

Published Dec 09, 2025

Tracked Since Feb 18, 2026