Apple Remote Desktop before 3.7 does not properly use server authentication-type information during decisions about whether to present an unencrypted-connection warning message, which allows remote attackers to obtain sensitive information in opportunistic circumstances by sniffing the network during an unintended cleartext VNC session.
The Remote Desktop full-screen feature in Apple OS X before 10.9 and Apple Remote Desktop before 3.7 sends dialog-box text to a connected remote host upon being woken from sleep, which allows physically proximate attackers to bypass intended access restrictions by entering a command in this box.