This indicates a potential denial-of-service to the SMTP server.
Simple Mail Transfer Protocol (SMTP) is a protocol used to send e-mail over the internet. There is a vulnerability where the SMTP server cannot handle a certain type of malformed command. This may result in a remote attacker to cause a denial of SMTP service. The server must be restarted to regain functionality.
Microsoft Exchange Server 2000
Microsoft Windows 2000
Microsoft Windows XP
This vulnerability may allow an attacker to cause a denial-of-service.
Apply appropriate patches or upgrade the system to the latest non-vulnerable version.