Buffer overflow in Microsoft Excel 2000 through 2003 allows user-assisted attackers to execute arbitrary code via a .xls file with a crafted COLINFO record, which triggers the overflow during a "data filling operation."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A545
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2006/ms06-037
http://www.vupen.com/english/advisories/2006/2755
http://www.securityfocus.com/bid/18888
http://www.securityfocus.com/archive/1/439909/100/0/threaded