ms11-047

MS11-047 is a Microsoft security bulletin from June 2011 addressing a vulnerability in Hyper-V on Windows Server 2008 and Windows Server 2008 R2. The vulnerability could allow a denial of service if an authenticated user in a guest virtual machine sends a specially crafted packet to the VMBus. Exploitation requires valid logon credentials and cannot be performed remotely or by anonymous users. The update resolves this privately reported issue and is rated Important. Discussions on WindowsForum.com cover the bulletin details, severity, and the specific conditions needed for exploitation.