This indicates an attack attempt to exploit a Memory Corruption vulnerability in MS Windows MediaPlayer.
This vulnerability is due to an attempt to access to an object which has been freed. A remote attacker may be able to exploit this to execute arbitrary code within context of the vulnerable application via a crafted file.
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows 8.1 for 32-bit Systems
Windows 8.1 for x64-based Systems
Windows Server 2012
Windows Server 2012 R2
Windows 10 for 32-bit Systems
Windows 10 for x64-based Systems
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor