This indicates an attack attempt to exploit an Integer Overflow vulnerability in Microsoft .Net Framework.
The vulnerability is due to improper bound checking when the vulnerable software handles maliciously crafted packets. An attacker can exploit this to cause denial of services conditions within the affected application.
Microsoft .NET Framework 2.0 Service Pack 2
Microsoft .NET Framework 4
Microsoft .NET Framework 4.5/4.5.1/4.5.2
Microsoft .NET Framework 4.6
Microsoft .NET Framework 3.5.1
Microsoft .NET Framework 3.5
Denial of Service: Remote attackers can crash vulnerable systems.
Apply the most recent upgrade or patch from the vendor.