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CVE-2019-0221 is an improper output-encoding vulnerability in Apache Tomcat Server Side Includes functionality. The SSI printenv command echoes user-controlled data into HTTP responses without escaping it, allowing injected script content to be interpreted by a victim's browser. Affected upstream versions are Tomcat 9.0.0.M1 through 9.0.0.17, 8.5.0 through 8.5.39, and 7.0.0 through 7.0.93.
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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.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
Apache Tomcat cross-site scripting vulnerability in the SSI printenv functionality.
A cross-site scripting vulnerability in Apache Tomcat's SSI printenv functionality.
Apache Tomcat cross-site scripting vulnerability in the Server Side Includes (SSI) printenv functionality.
A cross-site scripting vulnerability in Apache Tomcat's SSI printenv functionality.
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.