What is CVE-2021-21695?

CVE-2021-21695 is a high-severity vulnerability in Jenkins, classified under Improper Link Resolution Before File Access. CVSS score: 8.8/10. Published 2021-11-04.

How severe is CVE-2021-21695?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Jenkins

CVE-2021-21695

FilePath#listFiles lists files outside directories that agents are allowed to access when following symbolic links 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 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.021 (81.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

Jenkins
Jenkins Project — versions unspecified

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

www.jenkins.io/security/advisory/2021-11-04/ (Vendor Advisory)
www.openwall.com/lists/oss-security/2021/11/04/3 (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21695?: CVE-2021-21695 is a high-severity vulnerability in Jenkins, classified under Improper Link Resolution Before File Access. CVSS score: 8.8/10. Published 2021-11-04.
How severe is CVE-2021-21695?: High severity. CVSS v3 base score is 8.8 out of 10.