The remote host is missing an update to network-manager announced via advisory USN-727-2.
Details follow:
USN-727-1 fixed vulnerabilities in network-manager-applet. This advisory provides the corresponding updates for NetworkManager.
It was discovered that NetworkManager did not properly enforce permissions when responding to dbus requests. A local user could perform dbus queries to view system and user network connection passwords and pre-shared keys.
Solution: The problem can be corrected by upgrading your system to the following package versions: