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CVE-2013-4286 is an HTTP request-smuggling vulnerability in Apache Tomcat and affected JBoss Web deployments. When an HTTP or AJP connector processes inconsistent HTTP request framing headers, it can incorrectly determine the request length. Ambiguous requests containing multiple Content-Length headers or both a Content-Length header and Transfer-Encoding: chunked can cause a parsing discrepancy and permit request smuggling. The flaw is an incomplete fix for CVE-2005-2090. Affected upstream versions are Tomcat releases before 6.0.39, 7.x before 7.0.47, and 8.x before 8.0.0-RC3.
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What an attacker gets, and what they’ve been doing with it.
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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.
37 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Apache Tomcat HTTP request-smuggling vulnerability caused by an incomplete fix for malicious-request handling. Crafted requests combining Transfer-Encoding: chunked and Content-Length headers can enable web-cache poisoning, WAF bypass, and XSS attacks.
An Apache Tomcat HTTP request-smuggling vulnerability caused by improper handling of inconsistent HTTP request headers, allowing a remote attacker to cause incorrect request-length interpretation through conflicting Content-Length and Transfer-Encoding headers.
JBossWeb/Tomcat multiple Content-Length header poisoning flaws.
An HTTP request-handling flaw in JBoss Web that can enable web-cache poisoning, cross-site scripting, or disclosure of information from other requests through conflicting HTTP message-length headers.
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.