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 affects Firefox < 144 and Thunderbird < 144.
History

Wed, 15 Oct 2025 18:15:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Mozilla thunderbird
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Vendors & Products Mozilla
Mozilla firefox
Mozilla thunderbird

Wed, 15 Oct 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Wed, 15 Oct 2025 12:30:00 +0000

Type Values Removed Values Added
Title thunderbird: firefox: Memory safety bug fixed in Firefox 144 and Thunderbird 144
Weaknesses CWE-119
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}

threat_severity

Important


Tue, 14 Oct 2025 13:00:00 +0000

Type Values Removed Values Added
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 affects Firefox < 144 and Thunderbird < 144.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published: 2025-10-14T12:27:37.218Z

Updated: 2025-10-15T13:24:20.561Z

Reserved: 2025-10-13T19:50:24.598Z

Link: CVE-2025-11721

cve-icon Vulnrichment

Updated: 2025-10-15T13:20:46.007Z

cve-icon NVD

Status : Analyzed

Published: 2025-10-14T13:15:38.520

Modified: 2025-10-15T18:08:37.223

Link: CVE-2025-11721

cve-icon Redhat

Severity : Important

Publid Date: 2025-10-14T12:27:37Z

Links: CVE-2025-11721 - Bugzilla