CVE-2021-21686

HighCVSS 8.1/10Last modified Jun 17, 2026

Description

File path filters in the agent-to-controller security subsystem of Jenkins 2.318 and earlier, LTS 2.303.2 and earlier do not canonicalize paths, allowing operations to follow symbolic links to outside allowed directories.

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-59

Affected software

Vendor	Product	Versions
Jenkins project	Jenkins	>= unspecified, <= 2.318; >= unspecified, <= LTS 2.303.2

References

https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455Vendor Advisory
https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455Vendor Advisory

Timeline

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

Related CVEs from 2021

CVE-2021-216879.1Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not check agent-to-controller access to create symbolic links when unarchiving a sym CVE-2021-216887.5The agent-to-controller security check FilePath#reading(FileVisitor) in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not reject a CVE-2021-216899.1FilePath#unzip and FilePath#untar were not subject to any agent-to-controller access control in Jenkins 2.318 and earlier, LTS 2.303.2 and e CVE-2021-21694.9Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 5.7.33 an CVE-2021-216909.8Agent processes are able to completely bypass file path filtering by wrapping the file operation in an agent file path in Jenkins 2.318 and CVE-2021-216919.8Creating symbolic links is possible without the 'symlink' agent-to-controller access control permission in Jenkins 2.318 and earlier, LTS 2.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-controller CVE-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 earl CVE-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 wh CVE-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