Sun Calendar Express Web Server in Sun ONE Calendar Server 6.0 and Sun Java System Calendar Server 6 2004Q2 through 6.3-7.01 allows remote attackers to cause a denial of service (daemon crash) via multiple requests to the default URI with alphabetic characters in the tzid parameter.
http://www.vupen.com/english/advisories/2009/0905
http://www.securityfocus.com/archive/1/502320/100/0/threaded
http://sunsolve.sun.com/search/document.do?assetkey=1-66-255008-1
http://sunsolve.sun.com/search/document.do?assetkey=1-26-256228-1