The Catalina org.apache.catalina.connector.http package in Tomcat 4.0.x up to 4.0.3 allows remote attackers to cause a denial of service via several requests that do not follow the HTTP protocol, which causes Tomcat to reject later requests.
https://exchange.xforce.ibmcloud.com/vulnerabilities/13429
http://www.vupen.com/english/advisories/2008/1979/references
http://www.securityfocus.com/bid/8824
http://www.debian.org/security/2003/dsa-395
http://tomcat.apache.org/security-4.html
http://sunsolve.sun.com/search/document.do?assetkey=1-26-239312-1