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CVE-2019-16869 is an HTTP request-smuggling vulnerability in Netty versions before 4.1.42.Final. Netty incorrectly accepts whitespace between an HTTP header field name and its colon delimiter. This can create an HTTP parsing discrepancy between Netty and an upstream proxy, load balancer, or other intermediary that interprets the malformed header differently, enabling request desynchronization.
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No public exploit code observed for this vulnerability.
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27 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An HTTP request-smuggling flaw in Netty's handling of whitespace before HTTP header colons.
Netty HTTP request-smuggling vulnerability caused by improper handling of whitespace before the colon in HTTP headers.
Netty HTTP request-smuggling flaw caused by incorrect handling of whitespace before an HTTP header colon.
Netty HTTP request smuggling caused by mishandling whitespace before the colon in HTTP 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.