cmd5checkpw 0.21 and earlier allows remote attackers to cause a denial of service via an "SMTP AUTH" command with an unknown username.Referenceshttps://exchange.xforce.ibmcloud.com/vulnerabilities/5382http://www.securityfocus.com/bid/1809http://archives.neohapsis.com/archives/bugtraq/2000-10/0258.htmlhttp://members.elysium.pl/brush/cmd5checkpw/changes.html
