Microsoft Distributed Transaction Coordinator (MSDTC) for Windows NT 4.0 2000 SP4 XP SP1 and SP2 and Server 2003 allows remote attackers to cause a denial of service (crash) via a BuildContextW request with a large (1) UuidString or (2) GuidIn of a certain length which causes an out-of-range memory access aka the MSDTC Denial of Service Vulnerability. NOTE: this is a variant of CVE-2005-2119.