Vulnerability Monitor

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CVE-2025-0239

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.

Published

2025-01-07T16:15:38.563

Last Modified

2025-04-03T16:29:43.707

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 4.0 (MEDIUM)

Weaknesses

Type: Secondary
CWE-295

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	mozilla	firefox	< 128.6.0	Yes
Application	mozilla	firefox	< 134.0	Yes
Application	mozilla	thunderbird	< 128.6.0	Yes
Application	mozilla	thunderbird	< 134.0	Yes

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1929156 Issue Tracking, Permissions Required ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-01/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-02/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-04/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-05/ Vendor Advisory ([email protected])