Microsoft Excel 2016, Excel 2010 SP2, Excel 2013 RT SP1, and Office Web Apps Server 2013 SP1 allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted document, aka "Microsoft Office Memory Corruption Vulnerability." This vulnerability is different from those described in CVE-2017-0006, CVE-2017-0019, CVE-2017-0030, CVE-2017-0031, CVE-2017-0052, and CVE-2017-0053.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0020