{"cve":"CVE-2021-21686","nvd":{"published":"2021-11-04T17:15:08.277","modified":"2026-06-17T03:35:59.793","status":"Modified","description":"File path filters in the agent-to-controller security subsystem of Jenkins 2.318 and earlier, LTS 2.303.2 and earlier do not canonicalize paths, allowing operations to follow symbolic links to outside allowed directories.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-59"],"references":["https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455","https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455"],"products":["jenkins:jenkins"],"source":"nvd","synced_at":"2026-10-19T21:24:39.218183596+00:00"},"epss":{"cve":"CVE-2021-21686","score":0.01983,"percentile":0.80575,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-4g38-hrm4-rg94","url":"https://osv.dev/vulnerability/GHSA-4g38-hrm4-rg94","summary":"Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins","modified":"2024-02-16T07:57:55.539115Z","packages":[{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","purl":"pkg:maven/org.jenkins-ci.main/jenkins-core","ranges":["<2.303.3"],"fixed":["2.303.3"]},{"ecosystem":"Maven","name":"org.jenkins-ci.main:jenkins-core","purl":"pkg:maven/org.jenkins-ci.main/jenkins-core","ranges":[">=2.304 <2.319"],"fixed":["2.319"]}]}],"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."]}