Microsoft Excel 2002 SP3, Office 2004 and 2008 for Mac, and Open XML File Format Converter for Mac do not properly validate binary file-format information, which allows remote attackers to execute arbitrary code via a crafted Excel document, aka "Out-of-Bounds Memory Write in Parsing Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6738
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-080