win32k.sys in the kernel-mode drivers in Microsoft Windows Server 2008 R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 allows local users to gain privileges via a crafted TrueType font, aka "TrueType Font Parsing Remote Code Execution Vulnerability."
https://exchange.xforce.ibmcloud.com/vulnerabilities/100433
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-010