The Common Language Runtime (CLR) in Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, and 4.5 on 64-bit platforms does not properly allocate arrays of structures, which allows remote attackers to execute arbitrary code via a crafted .NET Framework application that changes array data, aka "Array Allocation Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A17071
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-052