CVEvulnerability

CVE-2021-21696

9.8 CRITICAL Published 2021-11-04 Modified 2026-06-17 Official page ↗

Status: Modified
Published: 2021-11-04
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected]): 7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P

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 configurations

• jenkins jenkins (<= 2.303.2) • jenkins jenkins (<= 2.318)

References

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