{"cve":"CVE-2025-6433","nvd":{"published":"2025-06-24T13:15:24.327","modified":"2026-09-30T18:10:00.190","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-295"],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=1954033","https://www.mozilla.org/security/advisories/mfsa2025-51/","https://www.mozilla.org/security/advisories/mfsa2025-54/"],"products":["mozilla:firefox"],"source":"nvd","synced_at":"2026-10-19T22:03:23.287444849+00:00"},"epss":{"cve":"CVE-2025-6433","score":0.00297,"percentile":0.22212,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}