The remote Windows host contains an application that is affected by a buffer overflow vulnerability.
The version of QuickTime installed on the remote Windows host is older than 7.4.1. Such versions contain a heap buffer overflow in the application's handling of HTTP responses when RTSP tunneling is enabled. If an attacker can trick a user to visit a specially-crafted webpage, he may be able to to execute arbitrary code on the remote host subject to the user's privileges.
Upgrade to version 7.4.1 or higher.