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 9.0.5, 9.0.6, 9.51, and 9.53, and possibly other versions, installs the MDaemon application folder with insecure permissions (Users create files/directories), which allows local users to execute arbitrary code by creating malicious RASAPI32.DLL or MPRAPI.DLL libraries in the MDaemon\APP folder, which is an untrusted search path element due to insecure permissions.

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.