Buffer overflow in Firefox for Android and Mozilla Firefox - CVE-2025-1943

Vulnerability identifier: #VU105320

CSH Severity: High

CVSS v4: 8.6 [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]

CVE-ID: CVE-2025-1943

CWE-ID: CWE-119

Exploitation vector: Remote access

Exploit availability: No public exploit available

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 trick the victim into visiting a specially crafted web page, trigger memory corruption and execute arbitrary code on the target system.

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

Firefox for Android
Mozilla Firefox
Gentoo Linux
Ubuntu
Fedora
Mozilla Thunderbird
www-client/firefox
www-client/firefox-bin
firefox
thunderbird (Ubuntu package)

Install updates from vendor's website.

Firefox for Android - update to 136.0
Mozilla Firefox - update to 136.0
Mozilla Thunderbird - update to 136.0
www-client/firefox - update to 60.8.0
www-client/firefox-bin - update to 60.8.0
firefox - addressed in versions 136.0-2.fc40, 136.0-2.fc41, 136.0-2.fc42
thunderbird (Ubuntu package) - update to 1:140.7.1+build1-0ubuntu0.22.04.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2025-14/
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1869650%2C1938451%2C1940326%2C1944052%2C1944063%2C1947281

• Multiple vulnerabilities in Mozilla Firefox
• Multiple vulnerabilities in Mozilla Thunderbird
• Fedora 41 update for firefox
• Fedora 42 update for firefox
• Fedora 40 update for firefox
• Gentoo update for Mozilla Firefox
• Ubuntu update for thunderbird