SSH Protocol Versions Supported
This entry from Security Metrics indicates that there may be some risk associated with knowing what protocol versions are supported by your SSH server.
Negotiation of protocol version is allowed under protocol. This is not a risk.
As part of the negotiation phase of SSH authentication, both the client and the server can announce under what protocols they are able to talk to each other. This negotiation is a standard procedure for the protocol and does not specifically indicate a risk but is rather normal operating procedure.