Hello,
If you are worried about those vulnerabilities, you can certainly upgrade to
8.3 (8.3(1.6)) code. You might have to take the help of TAC to get that
specific release. If you are upgrading to 8.3, I would suggest you to first
get used to 8.3 NAT format (it is significantly different from 8.2).
Hope this helps.
Regards,
NT