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CVE-2025-11721

CRITICAL CVSS: 9.8 Published: 2025-10-14 Modified: 2026-06-17

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.

Affected Platforms

Mozilla FirefoxMozilla Thunderbird

Weakness Type

CWE-119, CWE-119

References