Stack-based buffer overflow in Orbit downloader 2.6.3 and 2.6.4 allows remote attackers to execute arbitrary code via a long download URL, which is not properly handled during Unicode conversion for a balloon notification after a download has failed.

Argument injection vulnerability in orbitmxt.dll 2.1.0.2 in the Orbit Downloader 2.8.7 and earlier ActiveX control allows remote attackers to overwrite arbitrary files via whitespace and a command-line switch, followed by a full pathname, in the third argument to the download method.