Vulnerability · NVD

CVE-2025-6433

CVE-2025-6433, critical severity (CVSS 9.8): 1 tracked app concerned, all fixed or indeterminable on their current version.

Severity (CVSS): 9.8
Exploitation: -
Tracked apps: 1
Still exposed: 0

Published on 2025-06-24

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.

Attack vector : Network No privileges required No user interaction

Show raw CVSS vector

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

Tracked apps referencing this CVE

For each app: the affected range, the fixing version, and where the tracked app stands today.

Mozilla Firefox Windows winget:Mozilla.Firefox

Affected <140.0 Fixed in 140.0 Latest tracked 157.0 patched

Observed affected builds (123)

139.0.4 139.0.1 139.0 138.0.4 138.0.3 138.0.1 138.0 137.0.2 137.0.1 137.0 136.0.4 136.0.3 136.0.2 136.0.1 136.0 135.0.1 135.0 134.0.2 134.0.1 134.0 133.0.3 133.0 132.0.2 132.0.1 132.0 131.0.3 131.0.2 131.0 130.0.1 130.0 +93 · see history

Vulnerable CPE configurations (1)

Vendor	Product	Platform	Versions	CPE 2.3 URI
mozilla	firefox All platforms (wildcard)	All platforms (wildcard)	<140.0	cpe:2.3:a:mozilla:firefox:::::-:::*

View on NVD ↗ Advisory · www.mozilla.org

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