Unknown vulnerability in the Web calendaring component of Ipswitch IMail Server before 8.13 allows remote attackers to cause a denial of service (crash) via "specific content."

Multiple features in Ipswitch IMail Server before 8.13 allow remote attackers to cause a denial of service (crash) via (1) a long sender field to the Queue Manager or (2) a long To field to the Web Messaging component.

Buffer overflow in the Lightweight Directory Access Protocol (LDAP) daemon (iLDAP.exe 3.9.15.10) in Ipswitch IMail Server 8.03 allows remote attackers to cause a denial of service (crash) and execute arbitrary code via an LDAP message with a large tag length.

Heap-based buffer overflow in iaspam.dll in the SMTP Server in Ipswitch IMail Server 8.01 through 8.11 allows remote attackers to execute arbitrary code via a set of four different e-mail messages with a long boundary parameter in a certain malformed Content-Type header line, the string "MIME" by itself on a line in the header, and a long Content-Transfer-Encoding header line.

The STARTTLS implementation in the server in Ipswitch IMail 11.03 and earlier does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411.