What is CVE-2021-21687?

CVE-2021-21687 is a vulnerability in Jenkins that allows unauthorized creation of symbolic links during untar operations.

What is the severity of CVE-2021-21687?

CVE-2021-21687 has a severity rating of 9.1 (Critical).

How does CVE-2021-21687 impact Jenkins?

CVE-2021-21687 allows attackers to create symbolic links without proper access checks during untar operations in Jenkins, potentially leading to unauthorized access or system compromise.

Which versions of Jenkins are affected by CVE-2021-21687?

Jenkins versions 2.318 and earlier, as well as LTS 2.303.2 and earlier, are affected by CVE-2021-21687.

How can I fix CVE-2021-21687?

To fix CVE-2021-21687, upgrade to Jenkins version 2.319 or Jenkins LTS version 2.303.3.

Vulnerability/
CVE-2021-21687

critical

9.1

CWE

862

4/11/2021

22/11/2023

CVE-2021-21687

First published: Thu Nov 04 2021(Updated: )

Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not check agent-to-controller access to create symbolic links when unarchiving a symbolic link in FilePath#untar.

Credit: jenkinsci-cert@googlegroups.com jenkinsci-cert@googlegroups.com

Affected Software	Affected Version	How to fix
redhat/jenkins	<2.319	2.319
redhat/jenkins LTS	<2.303.3	2.303.3
Jenkins Jenkins	<2.303.3
Jenkins Jenkins	<2.319

Never miss a vulnerability like this again

Reference Links

Frequently Asked Questions

What is CVE-2021-21687?
CVE-2021-21687 is a vulnerability in Jenkins that allows unauthorized creation of symbolic links during untar operations.
What is the severity of CVE-2021-21687?
CVE-2021-21687 has a severity rating of 9.1 (Critical).
How does CVE-2021-21687 impact Jenkins?
CVE-2021-21687 allows attackers to create symbolic links without proper access checks during untar operations in Jenkins, potentially leading to unauthorized access or system compromise.
Which versions of Jenkins are affected by CVE-2021-21687?
Jenkins versions 2.318 and earlier, as well as LTS 2.303.2 and earlier, are affected by CVE-2021-21687.
How can I fix CVE-2021-21687?
To fix CVE-2021-21687, upgrade to Jenkins version 2.319 or Jenkins LTS version 2.303.3.

agent/author
agent/description
agent/event
agent/first-publish-date
agent/last-modified-date
agent/references
agent/severity
agent/softwarecombine
agent/tags
agent/type
agent/weakness
collector/nvd-api
collector/nvd-index
collector/redhat-bugzilla
source/Red Hat
alias/CVE-2021-21687
agent/software-canonical-lookup
vendor/jenkins
canonical/jenkins jenkins
package-manager/redhat

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.