CVE-2021-21696

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.

• http://www.openwall.com/lists/oss-security/2021/11/04/3Mailing List, Third Party Advisory
• https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2423Mitigation, Vendor Advisory
• http://www.openwall.com/lists/oss-security/2021/11/04/3Mailing List, Third Party Advisory
• https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2423Mitigation, Vendor Advisory

Published

Nov 4, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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