This script is Copyright (C) 2002-2011 Tenable Network Security, Inc.
It is possible to bypass the firewall on the remote host.
It is possible to connect to firewall-protected ports on the remote
host by setting the source port to 20. An attacker may use this
flaw to access services that should not be accessible to outsiders
on this host.
See also :
Update to 066 fix 2 or:
Reconfigure your firewall to reject any traffic coming from port 20.
Risk factor :
Medium / CVSS Base Score : 5.0
CVSS Temporal Score : 4.3
Public Exploit Available : true