{"id":"CVE-2021-21671","aliases":["BIT-jenkins-2021-21671","GHSA-4wr9-2xc6-jmg5"],"url":"https://o3.security/vulnerability/CVE-2021-21671","summary":"Session fixation vulnerability in Jenkins","details":"Jenkins 2.299 and earlier, LTS 2.289.1 and earlier does not invalidate the previous session on login.","published":"2021-06-30T17:15:08.987Z","modified":"2026-07-08T22:15:01.269429Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","fixedVersion":"2.300"},{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","fixedVersion":"2.289.2"}],"fix":null,"references":[{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/06/30/1"},{"type":"ADVISORY","url":"https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2371"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T22:15:01.269429Z"}}