hMailServer IMAP Remote Denial of Service Vulnerability

Summary
This host is running hMailServer and is prone to denial of service vulnerability.
Impact
Successful exploitation will allow the attacker to cause 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
This flaw is due to an error within the IMAP server when handling a long argument to the 'LOGIN' command.
Affected
hMailServer Version 5.3.3 Build 1879
References