Microsoft Internet Explorer allows remote attackers to cause a denial of service (crash) via an IFRAME with a certain XML file and XSL stylesheet that triggers a crash in mshtml.dll when a refresh is called, probably a null pointer dereference.Referenceshttp://www.securityfocus.com/bid/19364http://archives.neohapsis.com/archives/fulldisclosure/2006-08/0163.htmlhttp://www3.ca.com/be/securityadvisor/vulninfo/Vuln.aspx?ID=34511