CVE-2021-21691

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

Creating symbolic links is possible without the 'symlink' agent-to-controller access control permission in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

Affected software

No affected versions have been published.

Timeline

Published
Nov 4, 2021
Last modified
Jun 17, 2026
NVD status
Modified

Related CVEs from 2021

CVE-2021-216929.8FilePath#renameTo and FilePath#moveAllChildrenTo in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier only check 'read' agent-to-controllerCVE-2021-216939.8When creating temporary files, agent-to-controller access to create those files is only checked after they've been created in Jenkins 2.318 CVE-2021-216949.8FilePath#toURI, FilePath#hasSymlink, FilePath#absolutize, FilePath#isDescendant, and FilePath#get*DiskSpace do not check any permissions in CVE-2021-216958.8FilePath#listFiles lists files outside directories that agents are allowed to access when following symbolic links in Jenkins 2.318 and earlCVE-2021-216969.8Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not limit agent read/write access to the libs/ directory inside build directories whCVE-2021-216979.1Jenkins 2.318 and earlier, LTS 2.303.2 and earlier allows any agent to read and write the contents of any build directory stored in Jenkins CVE-2021-216987.5Jenkins Subversion Plugin 2.15.0 and earlier does not restrict the name of a file when looking up a subversion key file on the controller frCVE-2021-216995.4Jenkins Active Choices Plugin 2.5.6 and earlier does not escape the parameter name of reactive parameters and dynamic reference parameters, CVE-2021-21704.9Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.23 anCVE-2021-217005.4Jenkins Scriptler Plugin 3.3 and earlier does not escape the name of scripts on the UI when asking to confirm their deletion, resulting in aCVE-2021-217016.5Jenkins Performance Plugin 3.20 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.CVE-2021-217027.5In PHP versions 7.3.x below 7.3.27, 7.4.x below 7.4.15 and 8.0.x below 8.0.2, when using SOAP extension to connect to a SOAP server, a malic
CVE-2021-21691: Critical severity, CVSS 9.8 | Vulnix