CVE-2021-21696: Protection Mechanism Failure

November 4, 2021 (updated November 22, 2023)

Jenkins 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

www.openwall.com/lists/oss-security/2021/11/04/3
nvd.nist.gov/vuln/detail/CVE-2021-21696
www.jenkins.io/security/advisory/2021-11-04/

Code Behaviors & Features

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