The Bluetooth Stack 2.1 in Microsoft Windows Vista SP1 and SP2 and Windows 7 Gold and SP1 does not prevent access to objects in memory that (1) were not properly initialized or (2) have been deleted, which allows remote attackers to execute arbitrary code via crafted Bluetooth packets, aka "Bluetooth Stack Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12094
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-053