What is CVE-2021-21605?

CVE-2021-21605 is a high-severity vulnerability in Jenkins, classified under Path Traversal. CVSS score: 8.0/10. Published 2021-01-13.

How severe is CVE-2021-21605?

High severity. CVSS v3 base score is 8.0 out of 10.

Path Traversal in Jenkins

CVE-2021-21605

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier allows users with Agent/Configure permission to choose agent names that cause Jenkins to override the global `config.xml` file.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2021-01-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.022 (82.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000

Affected products

Jenkins
Jenkins Project — versions unspecified

Weakness classification (CWE)

CWE-22 — Path Traversal

References

www.jenkins.io/security/advisory/2021-01-13/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-21605?: CVE-2021-21605 is a high-severity vulnerability in Jenkins, classified under Path Traversal. CVSS score: 8.0/10. Published 2021-01-13.
How severe is CVE-2021-21605?: High severity. CVSS v3 base score is 8.0 out of 10.