Multiple unspecified vulnerabilities in MDaemon and WorldClient in Alt-N Technologies MDaemon before 9.50 allow attackers to cause a denial of service (memory consumption) via unspecified vectors resulting in memory leaks.

MDaemon Pro 3.5.1 and earlier allows local users to bypass the "lock server" security setting by pressing the Cancel button at the password prompt, then pressing the enter key.

Buffer overflow in Alt-N MDaemon 7.0.1 allows remote attackers to cause a denial of service (application crash) via a long STATUS command to the IMAP server.

Multiple heap-based buffer overflows in the POP3 server in Alt-N Technologies MDaemon before 9.0.6 allow remote attackers to cause a denial of service (daemon crash) and possibly execute arbitrary code via long strings that contain '@' characters in the (1) USER and (2) APOP commands.

Buffer overflow in Alt-N MDaemon, possibly 9.0.1 and earlier, allows remote attackers to execute arbitrary code via a long A0001 argument that begins with a '"' (double quote).