CVE-2025-0239

Published: Jan 7, 2025Modified: Apr 13, 2026

4.0

Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploitability: 2.5 / Impact: 1.4

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.

Affected (4)

Products: Mozilla: Firefox, Thunderbird

Mozilla

2 products

Firefox

Thunderbird

Configuration A

4 vulnerable

Vulnerable Software	Affected Versions
Mozilla Firefox	Before 134.0
Mozilla Firefox	Before 128.6.0
Mozilla Thunderbird	Before 128.6.0
Mozilla Thunderbird	From 129.0 to 134.0

Related CWEs

CWE-295

Improper Certificate Validation

The product does not validate, or incorrectly validates, a certificate.

References (6)

https://bugzilla.mozilla.org/show_bug.cgi?id=1929156

Source: security@mozilla.org

Issue TrackingPermissions Required

https://www.mozilla.org/security/advisories/mfsa2025-01/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-02/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-04/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-05/

Source: security@mozilla.org

Vendor Advisory

https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html

Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.