Microsoft Excel 2003 SP3 and Office 2004 for Mac do not properly handle objects in memory, which allows remote attackers to execute arbitrary code via a crafted Excel spreadsheet, aka "Record Memory Corruption Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14702
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-096