Vulnerability in Jenkins
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.
EPSS: 0.023 (82.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Jenkins
- Jenkins Project — versions unspecified
References
- jenkinsci-cert@googlegroups.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
- jenkinsci-cert@googlegroups.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-21696?
- CVE-2021-21696 is a critical-severity vulnerability in Jenkins. CVSS score: 9.8/10. Published 2021-11-04.
- How severe is CVE-2021-21696?
- Critical severity. CVSS v3 base score is 9.8 out of 10.