CVE-2025-6424

firefox: thunderbird: Use-after-free in FontFaceSet

Loading…

Severity

Important

Red Hat Product Security

7.5

CVSS 3.1

Review impact separately from score.

Published · June 24, 2025

Updated · June 30, 2026

Description

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: A use-after-free in FontFaceSet resulted in a potentially exploitable crash.

Statement

Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-416 · Use After Free