Microsoft Office Excel 2000 through 2004 allows user-assisted attackers to execute arbitrary code via malformed cell comments, which lead to modification of "critical data offsets" during the rebuilding process.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A234
https://exchange.xforce.ibmcloud.com/vulnerabilities/27604
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2006/ms06-037
http://www.zerodayinitiative.com/advisories/ZDI-06-022.html
http://www.vupen.com/english/advisories/2006/2755
http://www.securityfocus.com/bid/18938
http://www.securityfocus.com/archive/1/439786/100/0/threaded