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CVE-2016-9589 is an uncontrolled resource-consumption vulnerability in the Undertow HTTP server used by Red Hat JBoss Enterprise Application Platform 7 and WildFly versions before 11.0.0.Beta1. Undertow's ParseState header-values cache retains HTTP headers observed on persistent connections. Inefficient cache handling permits an attacker to populate the cache with garbage header data, consuming up to the configured maximum header count multiplied by the maximum header size for each active TCP connection. Default settings allow up to 200 headers of up to 1 MB each per connection.
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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 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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
WildFly/Undertow inefficient header-cache flaw that can be used to exhaust heap resources and cause denial of service.
Undertow inefficient header-cache vulnerability that can cause denial of service.
An inefficient Undertow/WildFly header cache that can be abused to consume heap resources and cause denial of service.
WildFly/EAP inefficient header-cache flaw that can be exploited to exhaust heap resources and cause denial of service.
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.