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CVE-2009-0033 is a denial-of-service vulnerability in Apache Tomcat 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through 6.0.18 when the Java AJP connector is used with mod_jk load balancing. A crafted request containing invalid headers, including a malformed HTTP Host header, causes the AJP connection to close. mod_jk marks the affected load-balancing worker as being in an error state and temporarily blocks it for approximately one minute. Repeated requests can place available workers into this state and interrupt application availability.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote denial-of-service vulnerability in Apache Tomcat's Java AJP connector when used with mod_jk load balancing. A crafted request containing invalid headers, such as a malformed HTTP Host header, can temporarily block connectors after an error and cause an application outage.
Denial-of-service vulnerability in Java AJP connector error handling.
AJP invalid-header denial of service affecting mod_jk load-balanced workers.
AJP invalid-header denial-of-service 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.