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.

INFO

Published Date :

2025-01-07T16:07:06.317Z

Last Modified :

2026-04-13T14:30:01.233Z

Source :

mozilla
AFFECTED PRODUCTS

The following products are affected by CVE-2025-0239 vulnerability.

Vendors Products
Mozilla
  • Firefox
  • Thunderbird
Redhat
  • Enterprise Linux
  • Rhel Aus
  • Rhel E4s
  • Rhel Els
  • Rhel Eus
  • Rhel Tus
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-0239.

URL Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1929156 cve-icon cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-0239 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-0239 cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-01/ cve-icon cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-02/ cve-icon cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-04/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-05/ cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact