Use-after-free in Mozilla products - CVE-2025-14321

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Main Vulnerability Database Vulnerabilities #VU119413

Use-after-free in Mozilla products - CVE-2025-14321

Published: December 9, 2025 / Updated: February 6, 2026


Vulnerability identifier: #VU119413
CSH Severity: High
CVSS v4: 8.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-14321
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: Public exploit is available

Vulnerability details

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the the WebRTC Signaling component. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.


Affected software

Firefox for Android
Mozilla Firefox
Firefox ESR
Debian Linux
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 15 SP3
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
Anolis OS
SUSE Enterprise Storage
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Desktop Applications Module
SUSE Package Hub 15
openSUSE Leap
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP Applications
openEuler
Ubuntu
Oracle Solaris
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
firefox-esr (Debian package)
thunderbird (Debian package)
firefox
firefox (Red Hat package)
thunderbird (Red Hat package)
MozillaFirefox-debugsource
MozillaFirefox-debuginfo
MozillaFirefox
MozillaFirefox-translations-common
MozillaFirefox-devel
MozillaThunderbird-translations-common
MozillaThunderbird-debugsource
MozillaThunderbird-debuginfo
MozillaThunderbird-translations-other
MozillaThunderbird
MozillaFirefox-translations-other
MozillaFirefox-branding-upstream
thunderbird-wayland
thunderbird-librnp-rnp
thunderbird-debugsource
thunderbird-debuginfo
thunderbird
firefox-debugsource
firefox-debuginfo
thunderbird (Ubuntu package)
Mozilla Thunderbird

How to mitigate CVE-2025-14321

Install updates from vendor's website.

Firefox for Android - update to 146.0
Mozilla Firefox - update to 146.0
Firefox ESR - update to 140.6.0
Mozilla Thunderbird - addressed in versions 140.6.0, 146.0
Oracle Solaris - addressed in versions 11.3 ESU 36.35, 11.4 SRU 89
firefox-esr (Debian package) - addressed in versions 140.6.0esr-1~deb12u1, 140.6.0esr-1~deb13u1
thunderbird (Debian package) - addressed in versions 1:140.6.0esr-1~deb12u1, 1:140.6.0esr-1~deb13u1
firefox - addressed in versions 140.6.0-1, 140.6.0-1.0.1, 140.6.0-1.0.2
firefox (Red Hat package) - addressed in versions 140.6.0-1.el7_9, 140.6.0-1.el8_2, 140.6.0-1.el8_10, 140.6.0-1.el9_0, 140.6.0-1.el9_2, 140.6.0-1.el9_4, 140.6.0-1.el9_7, 140.6.0-1.el10_0, 140.6.0-1.el10_1, 140.6.0-2.el8_4, 140.6.0-2.el8_6, 140.6.0-2.el8_8, 140.6.0-2.el9_6
thunderbird (Red Hat package) - addressed in versions 140.6.0-1.el8_2, 140.6.0-1.el8_4, 140.6.0-1.el8_6, 140.6.0-1.el8_8, 140.6.0-1.el8_10, 140.6.0-1.el9_0, 140.6.0-1.el9_2, 140.6.0-1.el9_4, 140.6.0-1.el9_6, 140.6.0-1.el9_7, 140.6.0-1.el10_0, 140.6.0-1.el10_1
MozillaFirefox-debugsource - addressed in versions 140.6.0-112.292.1, 140.6.0-150200.152.213.1, 140.6.0-160000.1.1
MozillaFirefox-debuginfo - addressed in versions 140.6.0-112.292.1, 140.6.0-150200.152.213.1, 140.6.0-160000.1.1
MozillaFirefox - addressed in versions 140.6.0-112.292.1, 140.6.0-150200.152.213.1, 140.6.0-160000.1.1
MozillaFirefox-translations-common - addressed in versions 140.6.0-112.292.1, 140.6.0-150200.152.213.1, 140.6.0-160000.1.1
MozillaFirefox-devel - addressed in versions 140.6.0-112.292.1, 140.6.0-150200.152.213.1, 140.6.0-160000.1.1
MozillaThunderbird-translations-common - update to 140.6.0-150200.8.248.1
MozillaThunderbird-debugsource - update to 140.6.0-150200.8.248.1
MozillaThunderbird-debuginfo - update to 140.6.0-150200.8.248.1
MozillaThunderbird-translations-other - update to 140.6.0-150200.8.248.1
MozillaThunderbird - update to 140.6.0-150200.8.248.1
MozillaFirefox-translations-other - addressed in versions 140.6.0-150200.152.213.1, 140.6.0-160000.1.1
MozillaFirefox-branding-upstream - update to 140.6.0-150200.152.213.1
firefox - update to 140.7.0-1
thunderbird-wayland - update to 140.7.0-1
thunderbird-librnp-rnp - update to 140.7.0-1
thunderbird-debugsource - update to 140.7.0-1
thunderbird-debuginfo - update to 140.7.0-1
thunderbird - update to 140.7.0-1
firefox-debugsource - update to 140.7.0-1
firefox-debuginfo - update to 140.7.0-1
thunderbird (Ubuntu package) - update to 1:140.7.1+build1-0ubuntu0.22.04.1
thunderbird - update to 140.12.0-1.0.1

Links to Public Exploits and PoC-codes

External References

Related Security Bulletins