CVE-2021-21629Network attack vector

Project builds via GET-enabled form submission

Published Mar 30, 2021 · Updated Aug 3, 2024

Cross-site request forgery in Jenkins Build With Parameters Plugin 1.5 and earlier allows remote attackers to start builds with chosen parameters. The parambuild form's BuildWithParametersAction.doConfigSubmit handler accepts non-POST requests because it lacks a RequirePOST guard. A victim with Item/Build permission must interact with attacker-controlled content; a successful request starts the configured job with attacker-specified parameter values.

CVSS severity8.8
High
EPSS probability0.76%
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 Build With Parameters Plugin 1.5 and earlier allows remote attackers to start builds with chosen parameters. The parambuild form's BuildWithParametersAction.doConfigSubmit handler accepts non-POST requests because it lacks a RequirePOST guard. A victim with Item/Build permission must interact with attacker-controlled content; a successful request starts the configured job with attacker-specified parameter values.

The record

CVE
CVE-2021-21629
Published
Mar 30, 2021
Updated
Aug 3, 2024
Vendor
Jenkins Project
Product
Build With Parameters Plugin
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 30, 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 <=1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jenkins Project · Build With Parameters Pluginversion=unspecified <=1.5

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)
T1204.001Malicious Link

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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