Unspecified vulnerability in the GpcContainer.GpcContainer.1 ActiveX control in WebEx allows remote attackers to cause a denial of service (memory access violation and crash) via (1) an invalid argument to the InitParam method or (2) an unspecified vector involving the SetParam method.

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.

Multiple buffer overflows in WebEx Downloader ActiveX Control, possibly in versions before November 2005, allow remote attackers to execute arbitrary code via unspecified vectors.