CVE-2025-6424

A use-after-free in FontFaceSet resulted in a potentially exploitable crash. This vulnerability affects Firefox < 140, Firefox ESR < 115.25, Firefox ESR < 128.12, Thunderbird < 140, and Thunderbird < 128.12.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1966423	Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-51/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-52/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-53/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-54/
https://www.mozilla.org/security/advisories/mfsa2025-55/
https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html
https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mozilla:firefox:::::esr:::*
	cpe:2.3:a:mozilla:firefox:::::-:::*
	cpe:2.3:a:mozilla:firefox:::::esr:::*

History

03 Nov 2025, 20:19

Type	Values Removed	Values Added
References		() https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html - () https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html -

02 Jul 2025, 21:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-06-24 13:15

Updated : 2025-11-03 20:19

NVD link : CVE-2025-6424

Mitre link : CVE-2025-6424

CVE.ORG link : CVE-2025-6424

JSON object : View

Products Affected

mozilla

firefox

CWE

CWE-416

Use After Free

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