{"cve":"CVE-2020-27178","nvd":{"published":"2020-10-16T16:15:11.573","modified":"2026-06-17T03:08:54.417","status":"Modified","description":"Apereo CAS 5.3.x before 5.3.16, 6.x before 6.1.7.2, 6.2.x before 6.2.4, and 6.3.x before 6.3.0-RC4 mishandles secret keys with Google Authenticator for multifactor authentication.","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:H/A:N","score":7.5},"cwes":[],"references":["https://apereo.github.io/2020/10/14/gauthvuln/","https://apereo.github.io/2020/10/14/gauthvuln/"],"products":["apereo:central_authentication_service"],"source":"nvd","synced_at":"2026-10-19T21:09:53.489947993+00:00"},"epss":{"cve":"CVE-2020-27178","score":0.01219,"percentile":0.68659,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-q39c-5vh5-vw2p","url":"https://osv.dev/vulnerability/GHSA-q39c-5vh5-vw2p","summary":"Improper Authentication in Apereo CAS","modified":"2024-02-17T05:34:53.535717Z","packages":[{"ecosystem":"Maven","name":"org.apereo.cas:cas-server-webapp","purl":"pkg:maven/org.apereo.cas/cas-server-webapp","ranges":[">=5.3.0 <5.3.16"],"fixed":["5.3.16"]},{"ecosystem":"Maven","name":"org.apereo.cas:cas-server-webapp","purl":"pkg:maven/org.apereo.cas/cas-server-webapp","ranges":[">=6.0.0 <6.1.7.2"],"fixed":["6.1.7.2"]},{"ecosystem":"Maven","name":"org.apereo.cas:cas-server-webapp","purl":"pkg:maven/org.apereo.cas/cas-server-webapp","ranges":[">=6.2.0 <6.2.4"],"fixed":["6.2.4"]},{"ecosystem":"Maven","name":"org.apereo.cas:cas-server-support-otp-mfa-core","purl":"pkg:maven/org.apereo.cas/cas-server-support-otp-mfa-core","ranges":[">=5.3.0 <5.3.16"],"fixed":["5.3.16"]},{"ecosystem":"Maven","name":"org.apereo.cas:cas-server-support-otp-mfa-core","purl":"pkg:maven/org.apereo.cas/cas-server-support-otp-mfa-core","ranges":[">=6.0.0 <6.1.7.2"],"fixed":["6.1.7.2"]},{"ecosystem":"Maven","name":"org.apereo.cas:cas-server-support-otp-mfa-core","purl":"pkg:maven/org.apereo.cas/cas-server-support-otp-mfa-core","ranges":[">=6.2.0 <6.2.4"],"fixed":["6.2.4"]}]}],"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."]}