CVE Vulnerabilities

CVE-2025-14321

Use After Free

Published: Dec 09, 2025 | Modified: Dec 11, 2025
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
7.5 IMPORTANT
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM

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

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Name Vendor Start Version End Version
Firefox Mozilla * 140.6.0 (excluding)
Firefox Mozilla * 146.0 (excluding)
Thunderbird Mozilla * 140.6.0 (excluding)
Thunderbird Mozilla * 146.0 (excluding)
Red Hat Enterprise Linux 10 RedHat firefox-0:140.6.0-1.el10_1 *
Red Hat Enterprise Linux 8 RedHat firefox-0:140.6.0-1.el8_10 *
Red Hat Enterprise Linux 9 RedHat firefox-0:140.6.0-1.el9_7 *
Mozjs102 Ubuntu esm-apps/noble *
Mozjs102 Ubuntu jammy *
Mozjs102 Ubuntu noble *
Mozjs115 Ubuntu noble *
Mozjs115 Ubuntu plucky *
Mozjs52 Ubuntu esm-apps/focal *
Mozjs52 Ubuntu esm-infra/bionic *
Mozjs68 Ubuntu esm-infra/focal *
Mozjs78 Ubuntu esm-apps/jammy *
Mozjs78 Ubuntu jammy *
Mozjs91 Ubuntu jammy *
Thunderbird Ubuntu jammy *

Potential Mitigations

References