MailEnable Professional before 1.78 provides a cleartext user password when an administrator edits the user's settings, which allows remote authenticated administrators to obtain sensitive information by viewing the HTML source.

The SMTP service of MailEnable Standard 1.92 and earlier, Professional 2.0 and earlier, and Enterprise 2.0 and earlier before the MESMTPC hotfix, allows remote attackers to cause a denial of service (application crash) via a HELO command with a null byte in the argument, possibly triggering a length inconsistency or a missing argument.

Webmail in MailEnable Professional Edition before 1.73 and Enterprise Edition before 1.21 allows remote attackers to cause a denial of service (CPU consumption) via unspecified vectors involving "incorrectly encoded quoted-printable emails".

IMAP service in MailEnable Professional Edition before 1.72 allows remote attackers to cause a denial of service (service crash) via unspecified vectors involving the EXAMINE command.

Multiple buffer overflows in MailEnable Professional 1.71 and Enterprise 1.1 before patch ME-10009 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via long (1) LIST, (2) LSUB, and (3) UID FETCH commands. NOTE: it is possible that these are alternate vectors for the issue described in CVE-2005-4402.

Buffer overflow in MailEnable Professional 1.71 and earlier, and Enterprise 1.1 and earlier, allows remote authenticated users to execute arbitrary code via a long IMAP EXAMINE command.