What is CVE-2021-21681?

CVE-2021-21681 is a medium-severity vulnerability in Jenkins Nomad, classified under Insufficiently Protected Credentials. CVSS score: 5.5/10. Published 2021-08-31.

How severe is CVE-2021-21681?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Jenkins Nomad

CVE-2021-21681

Jenkins Nomad Plugin 0.7.4 and earlier stores Docker passwords unencrypted in the global config.xml file on the Jenkins controller where they can be viewed by users with access to the Jenkins controller file system.

Published 2021-08-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (20.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Jenkins Nomad
Jenkins Project Nomad Plugin — versions unspecified

Weakness classification (CWE)

CWE-522 — Insufficiently Protected Credentials

References

www.jenkins.io/security/advisory/2021-08-31/ (Vendor Advisory)
www.openwall.com/lists/oss-security/2021/08/31/1 (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21681?: CVE-2021-21681 is a medium-severity vulnerability in Jenkins Nomad, classified under Insufficiently Protected Credentials. CVSS score: 5.5/10. Published 2021-08-31.
How severe is CVE-2021-21681?: Medium severity. CVSS v3 base score is 5.5 out of 10.