The remote host is vulnerable to multiple attack vectors.
The remote host is running TNFTPD, a port of the NetBSD FTP daemon. It is reported that this version of TNFTPD is vulnerable to multiple vulnerabilities in the signal handling functions. An attacker may remotely gain superuser privileges on the remote host. TNFTPD was formerly named lukemftpd.
Upgrade to tnftpd 20040810 or higher.