The (1) FTP, (2) POP3, (3) SMTP, and (4) NNTP servers in EServer 2.92 through 2.97, and possibly 2.98, allow remote attackers to cause a denial of service (crash) via a large amount of data.
Etype Eserv 2.97 allows remote attackers to cause a denial of service (resource exhaustion) via a large number of PASV commands that consume ports 1024 through 5000, which prevents the server from accepting valid PASV.