Microsoft Excel 2007 SP3, Excel 2010 SP2, Excel for Mac 2011 and 2016, Office Compatibility Pack SP3, and Excel Viewer allow remote attackers to execute arbitrary code via a crafted Office document, aka "Microsoft Office Memory Corruption Vulnerability."
https://www.exploit-db.com/exploits/38215/
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-099