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CVE-2021-21670

Improper permission checks allow canceling queue items and aborting builds in Jenkins

4.3 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
None

Exploit likelihood

2.04%Up 1.4 points since Jul 1, 2021
90%50%10%1%

What each source reports

NVD Score used 4.3

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.

Record
CVE-2021-21670
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS 2.0
4.0 MediumAV:N/AC:L/Au:S/C:N/I:P/A:N
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2021-21670
Updated
2026-11-02
EUVDEUVD-2022-4887 No score

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.

Record
EUVD-2022-4887
Updated
2026-11-03
GitHub AdvisoriesGHSA-q4wp-8c99-69pw 4.3

Improper permission checks allow canceling queue items and aborting builds in Jenkins

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.

Jenkins 2.300, LTS 2.289.2 requires that users have Item/Read permission for applicable types in addition to Item/Cancel permission.

As a workaround on earlier versions of Jenkins, do not grant Item/Cancel permission to users who do not have Item/Read permission.

Record
GHSA-q4wp-8c99-69pw
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
OSV 4.3

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.

Record
CVE-2021-21670
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVGHSA-q4wp-8c99-69pw 4.3

Improper permission checks allow canceling queue items and aborting builds in Jenkins

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.

Jenkins 2.300, LTS 2.289.2 requires that users have Item/Read permission for applicable types in addition to Item/Cancel permission.

As a workaround on earlier versions of Jenkins, do not grant Item/Cancel permission to users who do not have Item/Read permission.

Record
GHSA-q4wp-8c99-69pw
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
Show 4 moreShow less
OSVRHBA-2021:3033 7.5

Red Hat Bug Fix Advisory: OpenShift Container Platform 4.7.24 packages update

Record
RHBA-2021:3033
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHBA-2021:3396 7.5

Red Hat Bug Fix Advisory: OpenShift Container Platform 4.6.44 packages update

Record
RHBA-2021:3396
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2021:3820 7.5

Red Hat Security Advisory: OpenShift Container Platform 4.8.15 packages and security update

Record
RHSA-2021:3820
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVBIT-jenkins-2021-21670 No score

Jenkins 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.

Record
BIT-jenkins-2021-21670
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
org.jenkins-ci.main:jenkins-core
Maven
 through 2.289.1
2.289.2
org.jenkins-ci.main:jenkins-core
Maven
 2.292 to 2.299
2.300
jenkins
Bitnami
 before 2.300.0
2.300.0
org.jenkins-ci.main:jenkins-core
Maven
 before 2.289.2, plus listed versions
1.3961.3971.3981.3991.400
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1.4011.4031.4041.4051.4061.4071.4081.4091.409.11.409.21.409.31.4101.4111.4121.4131.4141.4151.4161.4171.4181.4191.4201.4211.4221.4231.4241.424.11.424.21.424.31.424.41.424.51.424.61.4251.4261.4271.4281.4291.4301.4311.4321.4331.4341.4351.4361.437
2.289.2
org.jenkins-ci.main:jenkins-core
Maven
 2.292 up to 2.300, plus listed versions
2.2932.2942.2952.2962.2972.2982.299
2.300
jenkins
Red Hat:openshift:4.7::el8
 before 0:2.289.2.1628252553-1.el8
0:2.289.2.1628252553-1.el8
jenkins
Red Hat:openshift:4.6::el8
 before 0:2.289.2.1629437819-1.el8
0:2.289.2.1629437819-1.el8
jenkins
Red Hat:openshift:4.8::el8
 before 0:2.289.3.1633554819-1.el8
0:2.289.3.1633554819-1.el8
butane
Red Hat:openshift:4.8::el8
 before 0:0.12.1-2.rhaos4.8.el8
0:0.12.1-2.rhaos4.8.el8
butane-debuginfo
Red Hat:openshift:4.8::el8
 before 0:0.12.1-2.rhaos4.8.el8
0:0.12.1-2.rhaos4.8.el8

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-21670 is a medium vulnerability (CVSS 4.3) in Jenkins, published June 30, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.04%, the 81st percentile. Fixed in org.jenkins-ci.main:jenkins-core 2.289.2.

References

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