{"id":"CVE-2021-21606","aliases":["BIT-jenkins-2021-21606","GHSA-f585-9fw3-rj2m"],"url":"https://o3.security/vulnerability/CVE-2021-21606","summary":"Arbitrary file existence check in file fingerprints in Jenkins","details":"Jenkins 2.274 and earlier, LTS 2.263.1 and earlier improperly validates the format of a provided fingerprint ID when checking for its existence allowing an attacker to check for the existence of XML files with a short path.","published":"2021-01-13T16:15:13.663Z","modified":"2026-07-08T12:06:27.770924Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","fixedVersion":"2.263.2"},{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","fixedVersion":"2.275"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2023"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T12:06:27.770924Z"}}