CVE-2025-0239

MediumCVSS 4.0/10Last modified Oct 5, 2026

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.

Metrics

CVSS 3.1 4.0/10CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-295

Affected software

No affected versions have been published.

Timeline

Published: Jan 7, 2025
Last modified: Oct 5, 2026
NVD status: Modified

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