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XCCDF
Guide to the Secure Configuration of Ubuntu 20.04
System Settings
Network Configuration and Firewalls
nftables
Ensure nftables Default Deny Firewall Policy
Ensure nftables Default Deny Firewall Policy
An XCCDF Rule
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Ensure nftables Default Deny Firewall Policy
Medium Severity
Base chain policy is the default verdict that will be applied to packets reaching the end of the chain. There are two policies: accept (Default) and drop. If the policy is set to accept, the firewall will accept any packet that is not configured to be denied and the packet will continue traversing the network stack.