Lotus Domino Web Server (nhttp.exe) before 6.0.1 allows remote attackers to cause a denial of service via a "Fictionary Value Field POST request" as demonstrated using the s_Validation form with a long, unknown parameter name.
https://exchange.xforce.ibmcloud.com/vulnerabilities/11361
http://www.securityfocus.com/bid/6951
http://www.cert.org/advisories/CA-2003-11.html
http://www-1.ibm.com/support/docview.wss?uid=swg21104528
http://archives.neohapsis.com/archives/vulnwatch/2003-q1/0086.html