secure remote CVS access

Hi to all, I have a problem which i need to solve. I need remote access to a CVS repository and i use ssh to do it. I have also a firewall which only limits incoming traffic to ssh. I think my CVS is good protected , but somehow i have a feelling i am missing something. Does this methology is safe way to protect my cvs data or there is a more reliable and secure way to do it? Any suggestions ? Thanks to all in advance JReis