{"cve":"CVE-2020-12423","nvd":{"published":"2020-07-09T15:15:12.193","modified":"2026-06-17T02:51:48.590","status":"Modified","description":"When the Windows DLL \"webauthn.dll\" was missing from the Operating System, and a malicious one was placed in a folder in the user's %PATH%, Firefox may have loaded the DLL, leading to arbitrary code execution. *Note: This issue only affects the Windows operating system; other operating systems are unaffected.* This vulnerability affects Firefox < 78.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-427"],"references":["http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html","http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html","https://bugzilla.mozilla.org/show_bug.cgi?id=1642400","https://www.mozilla.org/security/advisories/mfsa2020-24/","http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html"],"products":["mozilla:firefox"],"source":"nvd","synced_at":"2026-10-19T21:06:22.076270124+00:00"},"epss":{"cve":"CVE-2020-12423","score":0.00414,"percentile":0.35766,"date":"2026-10-31"},"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."]}