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

3/8/2024

CVE-2021-21687

First published: Thu Nov 04 2021(Updated: )

FilePath#untar does not check permission to create symbolic links when unarchiving a symbolic link.

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

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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.

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