What is CVE-2021-21687?

CVE-2021-21687 is a critical-severity vulnerability in Jenkins, classified under Missing Authorization. CVSS score: 9.1/10. Published 2021-11-04.

How severe is CVE-2021-21687?

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

Auth bypass in Jenkins

CVE-2021-21687

Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not check agent-to-controller access to create symbolic links when unarchiving a symbolic link in FilePath#untar.

Vulnerability class: Broken Access Control

EPSS: 0.013 (68.4th percentile) — read the EPSS interpretation.

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.

Affected products

Jenkins
Jenkins Project — versions unspecified

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

jenkinsci-cert@googlegroups.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2021-21687?: CVE-2021-21687 is a critical-severity vulnerability in Jenkins, classified under Missing Authorization. CVSS score: 9.1/10. Published 2021-11-04.
How severe is CVE-2021-21687?: Critical severity. CVSS v3 base score is 9.1 out of 10.