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XCCDF
Guide to the Secure Configuration of Ubuntu 20.04
System Settings
Network Configuration and Firewalls
Uncomplicated Firewall (ufw)
Ensure ufw Default Deny Firewall Policy
Ensure ufw Default Deny Firewall Policy
An XCCDF Rule
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Ensure ufw Default Deny Firewall Policy
Medium Severity
A default deny policy on connections ensures that any unconfigured network usage will be rejected. Note: Any port or protocol without a explicit allow before the default deny will be blocked.