What is CVE-2021-21627?

CVE-2021-21627 is a high-severity vulnerability in Jenkins Libvirt Agents, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2021-03-18.

How severe is CVE-2021-21627?

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

CSRF in Jenkins Libvirt Agents

CVE-2021-21627

A cross-site request forgery (CSRF) vulnerability in Jenkins Libvirt Agents Plugin 1.9.0 and earlier allows attackers to stop hypervisor domains.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-03-18 · 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: 0.008 (55.6th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Jenkins Libvirt Agents
Jenkins Project Libvirt Agents Plugin — versions unspecified

Weakness classification (CWE)

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

References

www.jenkins.io/security/advisory/2021-03-18/ (Vendor Advisory)
www.openwall.com/lists/oss-security/2021/03/18/5 (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21627?: CVE-2021-21627 is a high-severity vulnerability in Jenkins Libvirt Agents, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2021-03-18.
How severe is CVE-2021-21627?: High severity. CVSS v3 base score is 8.8 out of 10.