Buffer overflow in Mozilla Firefox - CVE-2025-0247

Vulnerability identifier: #VU102429

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-2025-0247

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 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.

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

Install updates from vendor's website.

Mozilla Firefox - update to 134.0
Mozilla Thunderbird - update to 134.0
Firefox for Android - update to 134.0
Firefox Focus for Android - update to 134.0
www-client/firefox - update to 104
firefox (Ubuntu package) - update to 134.0+build1-0ubuntu0.20.04.1
firefox - addressed in versions 134.0-1.fc40, 134.0-1.fc41
thunderbird (Ubuntu package) - update to 1:140.7.1+build1-0ubuntu0.22.04.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2025-01/

• Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
• Fedora 40 update for firefox
• Fedora 41 update for firefox
• Ubuntu update for firefox
• Multiple vulnerabilities in Mozilla Thunderbird
• Multiple vulnerabilities in Firefox for Android and Firefox Focus for Android
• Gentoo update for Mozilla Firefox
• Ubuntu update for thunderbird