CVE-2021-21670

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-06-30 · updated 2026-06-17

Description

Jenkins 2.299 and earlier, LTS 2.289.1 and earlier allows users to cancel queue items and abort builds of jobs for which they have Item/Cancel permission even when they do not have Item/Read permission.

Affected products

Jenkins: before 2.289.2; before 2.300 — fixed in 2.289.2, 2.300

How to fix

Upgrade to a fixed version: Jenkins 2.289.2, 2.300. Check the vendor advisory for mitigations.

References

http://www.openwall.com/lists/oss-security/2021/06/30/1
https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2278
http://www.openwall.com/lists/oss-security/2021/06/30/1
https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2278

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