CVE-2021-21686

CRITICAL9.0EPSS 0.51%

Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins

Published: 5/24/2022Modified: 4/3/2025

Description

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

Affected packages (2)

Bitnami/jenkinsfrom 0, < 2.319.0
Maven/org.jenkins-ci.main:jenkins-corefrom 0, < 2.303.3

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	CRITICAL9.0	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

References (6)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-21686
PATCHhttps://github.com/jenkinsci/jenkins
WEBhttps://github.com/jenkinsci/jenkins/commit/104c751d907919dd53f5090f84d53c671a66457b
WEBhttps://github.com/jenkinsci/jenkins/commit/5a245e42979abe4a26d41727c839521e36cedd74
WEBhttps://github.com/jenkinsci/jenkins/commit/63cde2daadc705edf086f2213b48c8c547f98358
WEBhttps://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455