TrevorH wrote:I'm sorry but you really need to. It's not safe to not do so. If you doubt that, go read the upstream vendor errata pages and look at all the updates that have been released by them since 6.5 was released on 21 November 2013. That's over 4 years worth of security updates that are missing on there.
Would you run Windows XP without patching it since 2013?
I know but i can't upgrade, in case i upgrade the system i will lose all the access to my storage 40 TB data. it's not a public system,its only used locally with a standalone network and no access to internet.