What’s Vulnerable › Vulnerabilities

CVE-2021-21696

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-04 · updated 2026-06-17

Description

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.

Affected products

• Jenkins: through 2.303.2; through 2.318

References

• http://www.openwall.com/lists/oss-security/2021/11/04/3
• https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2423
• http://www.openwall.com/lists/oss-security/2021/11/04/3
• https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2423

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