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CVE-2016-4993 is an HTTP response-splitting vulnerability in the Undertow web server used by WildFly 10.0.0 and Red Hat JBoss Enterprise Application Platform (EAP) 7 releases before 7.0.2. Undertow insufficiently sanitizes and validates user-controlled input before incorporating it into an HTTP response-header value. An attacker can introduce CRLF sequences to terminate an intended header and inject arbitrary subsequent HTTP headers or response content.
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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.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Prior Undertow HTTP header injection vulnerability referenced as having received an incomplete fix.
Undertow HTTP-header injection and HTTP response-splitting vulnerability.
A prior Undertow HTTP header-injection vulnerability referenced because its earlier fix was incomplete.
Undertow HTTP header injection and HTTP response-splitting vulnerability.
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.