Telnet-FTP Server 'RETR' Command Remote Denial of Service Vulnerability

Summary
This host is running Telnet-FTP Server and is prone to denial of service vulnerability.
Impact
Successful exploitation will allow remote attackers to crash the affected application, denying service to legitimate users. Impact Level: Application
Solution
No solution or patch was made available for at least one year since disclosure of this vulnerability. Likely none will be provided anymore. General solution options are to upgrade to a newer release, disable respective features, remove the product or replace the product by another one.
Insight
The flaw is caused due an error when handling 'RETR' command, which can be exploited to crash the FTP service by sending specially crafted FTP commands.
Affected
Telnet-Ftp Server version 1.218 and prior