CVE-2025-0239

MEDIUM EPSS 13.5%
Published Jan 7, 20251y ago · Modified Jun 17, 20262w ago
4.0 CVSS 3.1
Medium
Find Similar
Published Jan 7, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
4.0
Exploitability
2.5
Impact
1.4
Vector string
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
13.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-295

Affected Products 4

VendorProductVersionRange
mozillafirefox* <128.6.0
mozillafirefox* <134.0
mozillathunderbird* <128.6.0
mozillathunderbird*≥129.0  –  <134.0

References 6

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1929156
    Issue TrackingPermissions Required
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-01/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-02/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-04/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-05/
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.