Buffer overflow in Firefox ESR - CVE-2025-4093

Vulnerability identifier: #VU108050

CSH Severity: High

CVSS v4.0: 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-2025-4093

CWE-ID: CWE-119

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can create a specially crafted website, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Install updates from vendor's website.

• https://www.mozilla.org/en-US/security/advisories/mfsa2025-29/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1894100