You can scan Microsoft Telnet Service NTLM Authentication by using this tool.
This script enumerates information from remote Microsoft Telnet services with NTLM authentication enabled.
Sending a MS-TNAP NTLM authentication request with null credentials will cause the remote service to respond with a NTLMSSP message disclosing information to include NetBIOS, DNS, and OS build version.
Patches are available on the vendor website. Update your software to the latest version.