Improper certificate validation in Mozilla products - CVE-2025-1014

Vulnerability identifier: #VU103610

CSH Severity: Low

CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2025-1014

CWE-ID: CWE-295

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability allows a remote attacker to gain bypass implemented security restrictions.

The vulnerability exists due to improper certificate validation when adding certificates to a store. Firefox did not check certificate length, resulting only in trusted data being checked. A remote attacker can trick the victim into importing a malicious certificate into the certificate store and perform MitM attack.

Install updates from vendor's website.

• https://www.mozilla.org/en-US/security/advisories/mfsa2025-09/
• https://www.mozilla.org/en-US/security/advisories/mfsa2025-07/