What is CVE-2021-21620?

CVE-2021-21620 is a medium-severity vulnerability in Jenkins Claim, classified under Cross-Site Request Forgery (CSRF). CVSS score: 4.3/10. Published 2021-02-24.

How severe is CVE-2021-21620?

Medium severity. CVSS v3 base score is 4.3 out of 10.

CSRF in Jenkins Claim

CVE-2021-21620

A cross-site request forgery (CSRF) vulnerability in Jenkins Claim Plugin 2.18.1 and earlier allows attackers to change claims.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-02-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.016 (75.4th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Jenkins Claim
Jenkins Project Claim Plugin — versions unspecified

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

www.jenkins.io/security/advisory/2021-02-24/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-21620?: CVE-2021-21620 is a medium-severity vulnerability in Jenkins Claim, classified under Cross-Site Request Forgery (CSRF). CVSS score: 4.3/10. Published 2021-02-24.
How severe is CVE-2021-21620?: Medium severity. CVSS v3 base score is 4.3 out of 10.