The remote host is vulnerable to an arbitrary 'command insertion' flaw.
The remote host is running Axel, a download accelerator for FTP and HTTP protocols. This version of Axel is vulnerable to a remote buffer overflow due to the way that it parses server '302' messages. An attacker exploiting this flaw would need to be able to entice an Axel user to browse to their malicious website. Successful exploitation would result in the attacker running arbitrary commands on the system.
Upgrade to version 1.0b or higher.