Multiple stack-based buffer overflows in the HyleosChemView.HLChemView ActiveX control (HyleosChemView.ocx) in Hyleos ChemView 1.9.5.1 allow remote attackers to execute arbitrary code via a large number of white space characters in the filename argument to the (1) SaveasMolFile and (2) ReadMolFile methods.
http://www.security-assessment.com/files/advisories/2010-02-11_ChemviewX_Activex.pdf