CVE-2025-6424

CRITICAL

Firefox < 115.25.0, 115.25-115.*, 128.12-128.*, >=140 - Use-After-Free in FontFaceSet

Title source: llm
STIX 2.1

Description

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

References (8)

Core 8

Scores

CVSS v3 9.8
EPSS 0.0110
EPSS Percentile 78.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

CWE
CWE-416
Status published
Products (7)
mozilla/firefox < 115.25.0
mozilla/firefox < 140.0
Mozilla/Firefox 115.25 - 115.*
Mozilla/Firefox 128.12 - 128.*
Mozilla/Firefox 140
Mozilla/Thunderbird 128.12 - 128.*
Mozilla/Thunderbird 140
Published Jun 24, 2025
Tracked Since Feb 18, 2026