CVE-2025-0239 (GCVE-0-2025-0239)

Vulnerability from cvelistv5 – Published: 2025-01-07 16:07 – Updated: 2025-11-03 22:33
VLAI?
Summary
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.
Severity ?
4 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE
  • Alt-Svc ALPN validation failure when redirected
Assigner
References
Impacted products
Vendor Product Version
Mozilla Firefox Affected: unspecified , < 134 (custom)
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    Mozilla Firefox ESR Affected: unspecified , < 128.6 (custom)
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    Mozilla Thunderbird Affected: unspecified , < 134 (custom)
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    Mozilla Thunderbird Affected: unspecified , < 128.6 (custom)
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Credits
Paul Gerste
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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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