{"cve":"CVE-2021-21673","nvd":{"published":"2021-06-30T17:15:09.160","modified":"2026-06-17T03:35:58.460","status":"Modified","description":"Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":[],"references":["http://www.openwall.com/lists/oss-security/2021/06/30/1","https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2387","http://www.openwall.com/lists/oss-security/2021/06/30/1","https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2387"],"products":["jenkins:cas"],"source":"nvd","synced_at":"2026-10-19T21:20:07.141963181+00:00"},"epss":{"cve":"CVE-2021-21673","score":0.01584,"percentile":0.75578,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2vvr-5757-qp87","url":"https://osv.dev/vulnerability/GHSA-2vvr-5757-qp87","summary":"Open redirect vulnerability in Jenkins CAS Plugin","modified":"2024-02-16T08:13:13.036992Z","packages":[{"ecosystem":"Maven","name":"org.jenkins-ci.plugins:cas-plugin","purl":"pkg:maven/org.jenkins-ci.plugins/cas-plugin","ranges":["<1.6.1"],"fixed":["1.6.1"]}]}],"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."]}