CVE-2025-6424

CRITICAL EPSS 85.9%
Published Jun 24, 20251y ago · Modified Jun 17, 20261w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Jun 24, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
85.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 3

VendorProductVersionRange
mozillafirefox* <115.25.0
mozillafirefox* <140.0
mozillafirefox*≥116.0  –  <128.12.0

References 8

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.