Microsoft Office Excel 2002 SP3 and 2003 SP3, Office 2004 and 2008 for Mac, Open XML File Format Converter for Mac, and Office Excel Viewer 2003 SP3 do not properly parse the Excel file format, which allows remote attackers to execute arbitrary code via a crafted spreadsheet, aka "Excel Cache Memory Corruption Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6146
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-067