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CVE-2025-6424

Good to know:

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Date: June 24, 2025

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.

Severity Score

Related Resources (8)

https://nvd.nist.gov/vuln/detail/CVE-2025-6424
https://bugzilla.mozilla.org/show_bug.cgi?id=1966423
https://www.mozilla.org/security/advisories/mfsa2025-55/
https://www.mozilla.org/security/advisories/mfsa2025-54/
https://www.mozilla.org/security/advisories/mfsa2025-51/
https://www.mozilla.org/security/advisories/mfsa2025-53/
https://www.mozilla.org/security/advisories/mfsa2025-52/
https://www.mend.io/vulnerability-database/CVE-2025-6424

Severity Score

Weakness Type (CWE)

Use After Free

CWE-416

Top Fix

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Upgrade Version

Upgrade to version https://github.com/mozilla/gecko-dev.git - no_fix

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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