The LLTD Mapper in Microsoft Windows Vista does not properly gather responses to EMIT packets, which allows remote attackers to cause a denial of service (mapping failure) by omitting an ACK response, which triggers an XML syntax error.
osvdb.org/33660
www.securityfocus.com/archive/1/462793/100/0/threaded
www.securityfocus.com/archive/1/464617/100/0/threaded
www.securityfocus.com/bid/23271
www.symantec.com/avcenter/reference/Vista_Network_Attack_Surface_RTM.pdf
www.symantec.com/enterprise/security_response/weblog/2007/04/microsofts_inaccurate_teredo_d.html