The ActiveX controls in the HelpAsst component in NI Help Links in National Instruments LabWindows/CVI 2012 SP1 and earlier, LabVIEW 2012 SP1 and earlier, and other products allow remote attackers to cause a denial of service by triggering the display of local .chm files.
http://digital.ni.com/public.nsf/websearch/5C87A3AA7300868986257B3600501FE6?OpenDocument
http://digital.ni.com/public.nsf/websearch/507DEC9DA57A708186257B3600512623?OpenDocument
http://digital.ni.com/public.nsf/allkb/E6BC4F119D49A97A86257BD3004FE019?OpenDocument