This script is Copyright (C) 2014-2016 Tenable Network Security, Inc.
The remote FreeBSD host is missing a security-related update.
Unbound developer reports :
The resolver can be tricked into following an endless series of
delegations, this consumes a lot of resources.
See also :
Update the affected package.
Risk factor :
Medium / CVSS Base Score : 4.3
CVSS Temporal Score : 3.7
Public Exploit Available : true