CVE-2025-6433

CRITICAL

9.8

Description

If a user visited a webpage with an invalid TLS certificate, and granted an exception, the webpage was able to provide a WebAuthn challenge that the user would be prompted to complete. This is in violation of the WebAuthN spec which requires "a secure transport established without errors". This vulnerability was fixed in Firefox 140 and Thunderbird 140.

Details CVE

Score CVSS v3.19.8

SeveriteCRITICAL

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurNONE

Publie6/24/2025

Derniere modification4/13/2026

Sourcenvd

Observations honeypot0

Produits affectes

mozilla:firefox

Faiblesses (CWE)

CWE-295

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1954033(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2025-51/(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2025-54/(security@mozilla.org)

Correlations IOC

Aucune correlation enregistree

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