CVE-2025-0239

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 ESR < 128.6.

References

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

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

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

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

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

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3