They could be fixed through the kernel, or through the firewall (if it's
configured to). Also, fedora/redhat could've fixed the vulnerabilities,
and/or your version of BIND/Samba could be new enough to be fixed. Lastly,
it could be that those servers, if installed, are not active.
Man usually avoids attributing cleverness to somebody else -- unless it
is an enemy.
-- Albert Einstein