{"cve":"CVE-2020-14039","nvd":{"published":"2020-07-17T16:15:11.327","modified":"2026-06-17T02:54:08.570","status":"Modified","description":"In Go before 1.13.13 and 1.14.x before 1.14.5, Certificate.Verify may lack a check on the VerifyOptions.KeyUsages EKU requirements (if VerifyOptions.Roots equals nil and the installation is on Windows). Thus, X.509 certificate verification is incomplete.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-295"],"references":["http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00077.html","http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00082.html","http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00029.html","http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00030.html","https://groups.google.com/forum/#%21forum/golang-announce"],"products":["golang:go","opensuse:leap"],"source":"nvd","synced_at":"2026-10-19T21:06:22.076270124+00:00"},"epss":{"cve":"CVE-2020-14039","score":0.01762,"percentile":0.78017,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GO-2021-0223","url":"https://osv.dev/vulnerability/GO-2021-0223","summary":"Certificate verification error on Windows in crypto/x509","modified":"2024-05-20T16:03:47Z","packages":[{"ecosystem":"Go","name":"stdlib","purl":"pkg:golang/stdlib","ranges":["<1.13.13",">=1.14.0-0 <1.14.5"],"fixed":["1.13.13","1.14.5"]}]}],"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."]}