CVE-2021-21617Network attack vector

Job configuration changes via CSRF-enabled form endpoint

Published Feb 24, 2021 · Updated Aug 3, 2024

Cross-site request forgery in Jenkins Configuration Slicing Plugin 1.51 and earlier allows remote attackers to alter job slice configurations. The slice-reconfiguration form endpoint accepts state-changing requests without requiring POST, allowing a crafted cross-site request to submit attacker-selected jobs and values. A logged-in Jenkins user must visit attacker-controlled content; the request then applies configuration changes with that user's session.

CVSS severity8.8
High
EPSS probability0.94%
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 Configuration Slicing Plugin 1.51 and earlier allows remote attackers to alter job slice configurations. The slice-reconfiguration form endpoint accepts state-changing requests without requiring POST, allowing a crafted cross-site request to submit attacker-selected jobs and values. A logged-in Jenkins user must visit attacker-controlled content; the request then applies configuration changes with that user's session.

The record

CVE
CVE-2021-21617
Published
Feb 24, 2021
Updated
Aug 3, 2024
Vendor
Jenkins Project
Product
Configuration Slicing Plugin
Classifications
CWE-352, CAPEC-62, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 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 <=1.51

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jenkins Project · Configuration Slicing Pluginversion=unspecified <=1.51

Published CVSS scores

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

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)
CAPEC-62Cross Site Request Forgery
T1565.001Stored Data Manipulation

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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