SolarFTP USER Command Remote Denial of Service Vulnerability

Summary
The host is running SolarFTP Server and is prone to denial of service vulnerability.
Impact
Successful exploitation will allow remote attackers to cause a denial of service. 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 due to format string error while parsing 'USER' command, which can be exploited to crash the FTP service by sending 'USER' command with an overly long username parameter.
Affected
Flexbyte Software Solar FTP Server 2.1, other versions may also be affected.
References