Microsoft Visio 2003 SP3 and 2007 SP2 does not properly validate objects in memory during Visio file parsing, which allows remote attackers to execute arbitrary code via a crafted file, aka "Move Around the Block RCE Vulnerability."
Improper Input Validation The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.