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CVE-2021-21602 is an improper link-resolution vulnerability in Jenkins 2.274 and earlier and Jenkins LTS 2.263.1 and earlier. Jenkins file browsers for workspaces, archived artifacts, and user content follow symbolic links without adequately constraining the resolved target to the intended browsed directory. A user able to place or control a symbolic link can use the browser to read files located outside that directory.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced by this OpenShift Container Platform security advisory; no further details are provided in the content.
A Jenkins arbitrary file-read vulnerability in workspace-browser functionality.
An arbitrary file-read vulnerability in Jenkins workspace browsers.
A moderate-severity Jenkins arbitrary-file-read vulnerability caused by following symlinks in workspace and archived-artifact file browsers. An authenticated low-privilege user can read files outside the intended workspace or artifact location.
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.