Microsoft Office Excel 2002 SP3 and 2003 SP3, and Office Excel Viewer 2003 SP3, does not properly parse the Excel file format, which allows remote attackers to execute arbitrary code via a spreadsheet with a malformed record object, aka "Excel SxView Memory Corruption Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6474
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-067