What is CVE-2021-21689?

CVE-2021-21689 is a critical-severity vulnerability in Jenkins. CVSS score: 9.1/10. Published 2021-11-04.

How severe is CVE-2021-21689?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Jenkins

CVE-2021-21689

FilePath#unzip and FilePath#untar were not subject to any agent-to-controller access control in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier.

Published 2021-11-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.015 (73.4th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: +0.000

Affected products

Jenkins
Jenkins Project — versions unspecified

References

www.jenkins.io/security/advisory/2021-11-04/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-21689?: CVE-2021-21689 is a critical-severity vulnerability in Jenkins. CVSS score: 9.1/10. Published 2021-11-04.
How severe is CVE-2021-21689?: Critical severity. CVSS v3 base score is 9.1 out of 10.