WebEx Downloader ActiveX Control and WebEx Downloader Java before 2.1.0.0 do not validate downloaded components, which allows remote attackers to execute arbitrary code via a website that activates the GpcUrlRoot and GpcIniFileName ActiveX controls to cause the client to download a DLL file.
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.