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CVE-2025-14321

CriticalPublished

Use-after-free in the WebRTC: Signaling component

Published: Dec 9, 2025
Updated: Apr 13, 2026
Assigning CNA: mozilla
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

0.6%

Low · next 30 days

Percentile: 46.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2025-14321PoC
Proof-of-concept demonstrating a Use-After-Free vulnerability in Firefox's RTCEncodedFrameBase via WebRTC Encoded Transforms, enabling heap corruption and potential RCE.

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