CVE-2021-21641Network attack vector

Build promotion via non-POST action endpoints

Published Apr 7, 2021 · Updated Oct 15, 2024

Cross-site request forgery in Jenkins Promoted Builds Plugin 3.9 and earlier allows remote attackers to promote builds through crafted requests. The doForcePromotion, Status.doBuild, and ManualCondition.doApprove web methods lacked POST-only annotations and accepted state-changing requests. Exploitation requires an authenticated victim to follow an attacker-controlled request and can trigger regular, forced, or re-executed build promotions.

CVSS severity4.3
Medium
EPSS probability1.16%
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 Promoted Builds Plugin 3.9 and earlier allows remote attackers to promote builds through crafted requests. The doForcePromotion, Status.doBuild, and ManualCondition.doApprove web methods lacked POST-only annotations and accepted state-changing requests. Exploitation requires an authenticated victim to follow an attacker-controlled request and can trigger regular, forced, or re-executed build promotions.

The record

CVE
CVE-2021-21641
Published
Apr 7, 2021
Updated
Oct 15, 2024
Vendor
Jenkins Project
Product
Jenkins Promoted Builds Plugin
Classifications
CWE-352, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 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 <=3.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jenkins Project · Jenkins Promoted Builds Pluginversion=unspecified <=3.9

Published CVSS scores

4.3GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

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.

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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)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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