This indicates an attack attempt to exploit a Remote Code Execution Vulnerability in Microsoft Windows.
The vulnerability is due to an out of bounds error while parsing a HTML file in a vulnerable module. A remote attacker could exploit this to execute arbitrary code execution within the context of the application, via a crafted HTML file.
Microsoft Windows 7
Microsoft Windows Server 2008 R2
Microsoft Windows 8 and Windows 8.1
Microsoft Windows Server 2012 and Windows Server 2012 R2
Microsoft Windows RT and Windows RT 8.1
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.