CVE-2021-21627Network attack vector

Hypervisor domain shutdown via CSRF-prone endpoint

Published Mar 18, 2021 · Updated Aug 3, 2024

Cross-site request forgery in Jenkins Libvirt Agents Plugin 1.9.0 and earlier allows remote attackers to stop hypervisor domains. The form-submission endpoint accepts a state-changing request without requiring a CSRF-protected POST and invokes the domain shutdown action. Exploitation requires a logged-in Jenkins user's browser to send the crafted request, and success shuts down the selected guest workload.

CVSS severity8.8
High
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in Jenkins Libvirt Agents Plugin 1.9.0 and earlier allows remote attackers to stop hypervisor domains. The form-submission endpoint accepts a state-changing request without requiring a CSRF-protected POST and invokes the domain shutdown action. Exploitation requires a logged-in Jenkins user's browser to send the crafted request, and success shuts down the selected guest workload.

The record

CVE
CVE-2021-21627
Published
Mar 18, 2021
Updated
Aug 3, 2024
Vendor
Jenkins Project
Product
Libvirt Agents
Classifications
CWE-352, T1489
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=1.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jenkins Project · Libvirt Agentsversion=unspecified <=1.9.0

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1489Service Stop

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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