CVE-2025-11721

CriticalCVSS 9.8/10Last modified Oct 18, 2026

Description

Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 144 and Thunderbird 144.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-119

Affected software

No affected versions have been published.

Timeline

Published
Oct 14, 2025
Last modified
Oct 18, 2026
NVD status
Modified

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CVE-2025-11721: Critical severity, CVSS 9.8 | Vulnix