This script is Copyright (C) 2003-2017 Tenable Network Security, Inc.
The remote SMTP server is affected by an authorization bypass
It is possible to authenticate to the remote SMTP service by logging
in with a NULL session.
An attacker may use this flaw to use your SMTP server as a spam relay.
See also :
Microsoft has released patches for Windows NT and 2000 as well as
Exchange Server 5.5.
Risk factor :
Medium / CVSS Base Score : 6.4
CVSS Temporal Score : 4.7
Public Exploit Available : false