The PE Loader service in Microsoft .NET Framework 1.0, 1.1, and 2.0 for Windows 2000, XP, Server 2003, and Vista allows remote attackers to execute arbitrary code via unspecified vectors involving an "unchecked buffer" and unvalidated message lengths, probably a buffer overflow.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2093
https://exchange.xforce.ibmcloud.com/vulnerabilities/34637
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-040
http://www.vupen.com/english/advisories/2007/2482
http://www.us-cert.gov/cas/techalerts/TA07-191A.html
http://www.securitytracker.com/id?1018356
http://www.securityfocus.com/bid/24778
http://secunia.com/advisories/26003
http://archive.cert.uni-stuttgart.de/bugtraq/2007/07/msg00254.html