Microsoft Office Excel 2007 SP1 and SP2 and Office 2004 for Mac do not properly parse the Excel file format, which allows remote attackers to execute arbitrary code via a crafted spreadsheet that triggers access of an uninitialized stack variable, aka "Microsoft Office Excel FNGROUPNAME Record Uninitialized Memory Vulnerability."
Improper Control of Generation of Code The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.