CVE-2021-21685
critical
CVSS 9.1
EPSS 1.5%
Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not check agent-to-controller access to create parent directories in FilePath#mkdirs.
Versions it affects
Software versions checked with the free lookup that CVE-2021-21685 applies to, and the release that fixes it where the sources name one.
Is this running somewhere in your estate?
The Vulnerability Reporter inventories every machine and tells you when an advisory like this one applies to you.