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CVE-2021-21615 is a time-of-check to time-of-use race condition in Jenkins file-browser handling for workspaces and archived artifacts. Jenkins versions 2.275 and LTS 2.263.2 can follow symbolic links outside the intended restricted directory after validating a path. A privileged user who controls workspace contents can use this behavior to traverse the filesystem and read files accessible to the Jenkins process.
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No public exploit code observed for this vulnerability.
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A Jenkins filesystem-traversal vulnerability affecting privileged users.
A filesystem-traversal vulnerability in Jenkins that can be used by privileged users.
A moderate-severity Jenkins arbitrary-file-read vulnerability caused by a TOCTOU race in the workspace and archived-artifact file browser. It requires low privileges and has high confidentiality impact (CVSS 5.3).
A Jenkins arbitrary-file-read vulnerability caused by a TOCTOU race condition in the file browser for workspaces and archived artifacts. It affects Jenkins 2.275 and LTS 2.263.2, and was addressed for Red Hat OpenShift Container Platform 4.5 and 4.6 through RHSA-2021:0429 and RHSA-2021:0423, respectively.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.