CVE-2025-14321
criticalUse-after-free in the WebRTC: Signaling component.
Vendor / product: Mozilla — firefox
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.
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2025-12-09 16:17
Modified: 2026-10-07 20:10
NVD status: Modified
Last synced 2 days ago
Verified against the source API 2026-10-27 07:06 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
mozilla / firefox <140.6.0, <146.0
mozilla / thunderbird <140.6.0, <146.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
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/
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1992760 security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2025-92/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2025-94/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2025-95/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2025-96/ security@mozilla.org
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:06 UTC · record ↗