CVE-2021-21696
CRITICALJenkins < 2.303.2, < 2.318 - Unauthenticated Arbitrary File Write via FilePath API
Title source: llmDescription
Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not limit agent read/write access to the libs/ directory inside build directories when using the FilePath APIs, allowing attackers in control of agent processes to replace the code of a trusted library with a modified variant. This results in unsandboxed code execution in the Jenkins controller process.
References (2)
Core 2
Core References
Mitigation, Vendor Advisory x_refsource_confirm
https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2423
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
http://www.openwall.com/lists/oss-security/2021/11/04/3
Scores
CVSS v3
9.8
EPSS
0.0095
EPSS Percentile
76.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Details
Status
published
Products (3)
jenkins/jenkins
< 2.303.2
jenkins/jenkins
< 2.318
org.jenkins-ci.main/jenkins-core
0 - 2.303.3Maven
Published
Nov 04, 2021
Tracked Since
Feb 18, 2026