Spoofing attack in Mozilla products - CVE-2025-3029

Vulnerability identifier: #VU106359

CSH Severity: Medium

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

CVE-ID: CVE-2025-3029

CWE-ID: CWE-451

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 15 SP3
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
Oracle Linux
Gentoo Linux
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 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 ARM 64
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 Server - AUS
Red Hat Enterprise Linux Server - TUS
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
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Slackware Linux
Desktop Applications Module
SUSE Package Hub 15
openSUSE Leap
openEuler
Ubuntu
Fedora
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
www-client/firefox-bin
www-client/firefox
dev-lang/spidermonkey
mail-client/thunderbird-bin
mail-client/thunderbird
mozilla-firefox
mozilla-thunderbird
thunderbird (Debian package)
firefox-esr (Debian package)
firefox-debugsource
firefox-debuginfo
firefox
firefox (Red Hat package)
thunderbird (Red Hat package)
thunderbird
MozillaFirefox
MozillaFirefox-translations-common
MozillaFirefox-debugsource
MozillaFirefox-debuginfo
MozillaFirefox-devel
MozillaThunderbird-debugsource
MozillaThunderbird-translations-other
MozillaThunderbird-translations-common
MozillaThunderbird-debuginfo
MozillaThunderbird
MozillaFirefox-translations-other
MozillaFirefox-branding-upstream
thunderbird-debuginfo
thunderbird-debugsource
thunderbird-librnp-rnp
thunderbird-wayland
thunderbird (Ubuntu package)
Mozilla Thunderbird

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of non-BMP unicode characters. A remote attacker can use a specially crafted URL to spoof the URL bar in the browser.

Install updates from vendor's website.

• https://bugzilla.mozilla.org/show_bug.cgi?id=1952213
• https://www.mozilla.org/security/advisories/mfsa2025-20/
• https://www.mozilla.org/security/advisories/mfsa2025-22/