Windows Meeting Space in Vista

From the National Vulnerability Database:

DFSR.exe in Windows Meeting Space in Microsoft Windows Vista remains available for remote connections on TCP port 5722 after Windows Meeting Space is closed, which allows remote attackers to have an unknown impact by connecting to this port.

In other words, if you're running Vista and using Meeting Space, use extreme caution. At this time, there are no known workarounds, but I expect firewalling port 5722 when you aren't using it would go a long ways toward mitigating the problem.