SMTP service in SmarterTools SmarterMail 1.6.1511 and 1.6.1529 allows remote attackers to cause a denial of service (CPU consumption) via a large number of simultaneous open connections to TCP port 25.

login.aspx in SmarterTools SmarterMail 1.6.1511 and 1.6.1529 allows remote attackers to cause a denial of service via a long txtusername parameter, possibly due to a buffer overflow.

Directory traversal vulnerability in frmGetAttachment.aspx in SmarterTools SmarterMail 1.6.1511 and 1.6.1529 allows remote attackers to read arbitrary files via the filename parameter.

Cross-site scripting (XSS) vulnerability in frmCompose.aspx in SmarterTools SmarterMail 1.6.1511 and 1.6.1529 allows remote attackers to inject arbitrary web script or HTML via Javascript to the "check spelling" feature in the compose area.

frmAddfolder.aspx in SmarterTools SmarterMail 1.6.1511 and 1.6.1529 allows remote authenticated users to create a folder that SmarterMail cannot delete or rename via a folder name with a null byte ("%00"). NOTE: it is not clear whether this issue poses a vulnerability.