More information about this security flaw is available in the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=2320141 Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Mitigation at network or VPN level is appropriate, this is not being treated as a bug in the DHCP client.