Stack-based buffer overflow in Atrium MERCUR IMAPD allows remote attackers to have an unknown impact via a certain SUBSCRIBE command.

Unspecified vulnerability in MERCUR Messaging 2005 before Service Pack 4 allows remote attackers to cause a denial of service (crash) via a TOP command to the POP3 service.

The SMTP service in MERCUR Messaging 2005 before Service Pack 4 allows remote attackers to cause a denial of service (infinite loop) via a message in which neither the originator nor recipient address is known.

Multiple buffer overflows in MERCUR Messaging 2005 before Service Pack 4 allow remote attackers to cause a denial of service (crash) via (1) "long command lines at port 32000" and (2) certain name service queries that are not properly handled by the SMTP service.

The IMAP4 service in MERCUR Messaging 2005 before Service Pack 4 allows remote attackers to cause a denial of service (crash) via a message with a long subject field.