Microsoft Excel 2007 SP3; the proofing tools in Office 2010 SP2; Excel 2010 SP2; Excel 2013 Gold, SP1, and RT; Excel Viewer; and Office Compatibility Pack SP3 allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted Office document, aka "Excel Remote Code Execution Vulnerability."
https://exchange.xforce.ibmcloud.com/vulnerabilities/100439
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-012
http://www.securitytracker.com/id/1031720