Unspecified vulnerability in Microsoft Office Excel Viewer 2003 up to SP3 allows user-assisted remote attackers to execute arbitrary code via an Excel document with malformed cell comments that trigger memory corruption from an "allocation error," aka "Microsoft Office Cell Parsing Memory Corruption Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5421
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2008/ms08-016
http://www.zerodayinitiative.com/advisories/ZDI-08-008
http://www.vupen.com/english/advisories/2008/0848/references
http://www.us-cert.gov/cas/techalerts/TA08-071A.html
http://www.securitytracker.com/id?1019578
http://www.securityfocus.com/archive/1/489415/100/0/threaded