The remote host is running an instant messaging application that is vulnerable to a security bypass attack.
The version of Skype installed on the remote host is earlier than 220.127.116.11. Such versions are potentially affected by a flaw in the handling of specially crafted 'skype: ' URIs. An attacker, exploiting this flaw, could control certain Skype settings and possibly gain access to sensitive information.
Upgrade to Skype 18.104.22.168 or later.