CVE-2025-0239

MEDIUM
2025-01-07 [email protected]
4.0
CVSS 3.1
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CVSS Vector

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

Lifecycle Timeline

3
Patch Released
Apr 02, 2026 - 20:30 nvd
Patch available
Analysis Generated
Mar 28, 2026 - 18:02 vuln.today
CVE Published
Jan 07, 2025 - 16:15 nvd
MEDIUM 4.0

Tags

Information Disclosure Mozilla Firefox Thunderbird Redhat Suse

Description

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

Analysis

When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. Rated medium severity (CVSS 4.0), this vulnerability is no authentication required, low attack complexity. No vendor patch available.

Technical Context

This vulnerability is classified under CWE-295. When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. This vulnerability affects Firefox < 134, Firefox ESR < 128.6, Thunderbird < 134, and Thunderbird < 128.6. Affected products include: Mozilla Firefox, Mozilla Thunderbird.

Affected Products

Mozilla Firefox, Mozilla Thunderbird.

Remediation

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Priority Score

20
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +20
POC: 0

Vendor Status

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CVE-2025-0239 vulnerability details – vuln.today
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