What is CVE-2021-21693?

CVE-2021-21693 is a critical-severity vulnerability in Jenkins, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2021-11-04.

How severe is CVE-2021-21693?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Jenkins

CVE-2021-21693

When creating temporary files, agent-to-controller access to create those files is only checked after they've been created in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier.

Vulnerability class: Broken Access Control

EPSS: 0.015 (71.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Jenkins
Jenkins Project — versions unspecified

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

jenkinsci-cert@googlegroups.com (Vendor Advisory)

Frequently asked questions

What is CVE-2021-21693?: CVE-2021-21693 is a critical-severity vulnerability in Jenkins, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2021-11-04.
How severe is CVE-2021-21693?: Critical severity. CVSS v3 base score is 9.8 out of 10.