There are a couple of things that can cause this behavior. First I would suggest that you check the configuration of the routers and switches and look for the command privilege level 15. That would send anyone who logs in directly to privilege mode. If you find this command remove it and your problem probably is over.
If it is not privilege level specified on the vty lines it is probably configured in ACS to authorize privilege mode. The more complete solution is to configure the user profiles and remove the privilege access. A quicker way would be to remove the authorization in aaa which will effectively remove the capability from everyone.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...