At first connection to port 22, the server sends his ID string with the version number. I think that this should be configurable (a fake version number e.g.) in order to hinder attacks based on known vulnerabilities. Someone could gain a bit of time in order to replace its old unsecure version of the ssh server with a new one.
This has been done to death several times before, please see bug #764. *** This bug has been marked as a duplicate of 764 ***
Change all RESOLVED bug to CLOSED with the exception of the ones fixed post-4.4.