Use of Uninitialized Variable in Mozilla products - CVE-2025-9181

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Main Vulnerability Database Vulnerabilities #VU114387

Use of Uninitialized Variable in Mozilla products - CVE-2025-9181

Published: August 22, 2025


Vulnerability identifier: #VU114387
CSH Severity: High
CVSS v4 BT: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]
CVE-ID: CVE-2025-9181
CWE-ID: CWE-457
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to use of uninitialized memory in the JavaScript engine. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the system.


Affected software

Firefox ESR
Mozilla Firefox
Firefox for Android
Firefox Focus for Android
Debian Linux
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP3
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 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 ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
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
SUSE Package Hub 15
Desktop Applications Module
openSUSE Leap
Ubuntu
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
thunderbird (Debian package)
firefox-esr (Debian package)
firefox
firefox-debugsource
firefox-debuginfo
firefox (Red Hat package)
thunderbird (Red Hat package)
thunderbird
MozillaFirefox
MozillaFirefox-translations-common
MozillaFirefox-debuginfo
MozillaFirefox-debugsource
MozillaFirefox-devel
MozillaThunderbird-translations-other
MozillaThunderbird-debuginfo
MozillaThunderbird-translations-common
MozillaThunderbird
MozillaThunderbird-debugsource
MozillaFirefox-translations-other
MozillaFirefox-branding-upstream
thunderbird (Ubuntu package)
Mozilla Thunderbird

How to mitigate CVE-2025-9181

Install updates from vendor's website.

Firefox ESR - addressed in versions 128.14.0, 140.2.0
Firefox for Android - update to 142.0
Mozilla Firefox - update to 142.0
Firefox Focus for Android - update to 142.0
Mozilla Thunderbird - addressed in versions 128.14, 140.2, 142.0
thunderbird (Debian package) - addressed in versions 1:128.14.0esr-1~deb12u1, 1:128.14.0esr-1~deb13u1
firefox-esr (Debian package) - addressed in versions 128.14.0esr-1~deb12u1, 128.14.0esr-1~deb13u1
firefox - update to 128.14.0-1
firefox - addressed in versions 128.14.0-1, 128.14.0-2.0.1, 128.14.0-2.0.2
firefox-debugsource - update to 128.14.0-1
firefox-debuginfo - update to 128.14.0-1
firefox (Red Hat package) - addressed in versions 128.14.0-2.el7_9, 128.14.0-2.el8_2, 128.14.0-2.el8_4, 128.14.0-2.el8_6, 128.14.0-2.el8_8, 128.14.0-2.el8_10, 128.14.0-2.el9_0, 128.14.0-2.el9_2, 128.14.0-2.el9_4, 128.14.0-2.el9_6, 128.14.0-2.el10_0
thunderbird (Red Hat package) - addressed in versions 128.14.0-3.el8_2, 128.14.0-3.el8_4, 128.14.0-3.el8_6, 128.14.0-3.el8_8, 128.14.0-3.el8_10, 128.14.0-3.el9_0, 128.14.0-3.el9_2, 128.14.0-3.el9_4, 128.14.0-3.el9_6, 128.14.0-3.el10_0
thunderbird - update to 128.14.0-3.0.1
MozillaFirefox - addressed in versions 140.2.0-112.276.1, 140.2.0-150200.152.198.1
MozillaFirefox-translations-common - addressed in versions 140.2.0-112.276.1, 140.2.0-150200.152.198.1
MozillaFirefox-debuginfo - addressed in versions 140.2.0-112.276.1, 140.2.0-150200.152.198.1
MozillaFirefox-debugsource - addressed in versions 140.2.0-112.276.1, 140.2.0-150200.152.198.1
MozillaFirefox-devel - addressed in versions 140.2.0-112.276.1, 140.2.0-150200.152.198.1
MozillaThunderbird-translations-other - update to 140.2.0-150200.8.236.1
MozillaThunderbird-debuginfo - update to 140.2.0-150200.8.236.1
MozillaThunderbird-translations-common - update to 140.2.0-150200.8.236.1
MozillaThunderbird - update to 140.2.0-150200.8.236.1
MozillaThunderbird-debugsource - update to 140.2.0-150200.8.236.1
MozillaFirefox-translations-other - update to 140.2.0-150200.152.198.1
MozillaFirefox-branding-upstream - update to 140.2.0-150200.152.198.1
thunderbird (Ubuntu package) - update to 1:140.7.1+build1-0ubuntu0.22.04.1

External References

Related Security Bulletins