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CVE-2021-21604 is an unsafe deserialization vulnerability in Jenkins 2.274 and earlier and Jenkins LTS 2.263.1 and earlier. When XML REST API deserialization fails because submitted data is invalid, Jenkins can retain invalid object references in Old Data Monitor. An attacker authorized to create or configure applicable Jenkins objects can submit crafted content that is retained there. If an administrator subsequently discards the recorded old data, Jenkins can instantiate potentially unsafe objects.
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No public exploit code observed for this vulnerability.
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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 flaw involving improper handling of REST API XML deserialization errors.
A Jenkins flaw involving improper handling of REST API XML deserialization errors.
An important Jenkins unsafe deserialization flaw in the Old Data Monitor. A low-privileged authenticated attacker can inject crafted content that may instantiate unsafe objects when an administrator discards it, affecting confidentiality, integrity, and availability.
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.