I have one of these running to connect to CDO (or whatever Cisco names it today) and what I can't find is if it has been patched with recent security updates. I found a doc with details on doing an update, BUT, they don't work.
cdo@sdc:~$ sudo su sdc
[sudo] password for cdo:
sdc@sdc:/home/cdo$ sdc upgrade
bash: sdc: command not found
sdc@sdc:/home/cdo$ upgrade
bash: upgrade: command not found
In fact nothing regarding sdc works.
apt however works.