What type of control is described when a firewall automatically creates new rules to block malicious traffic?

The type of control that is described when a firewall automatically creates new rules to block malicious traffic is categorized as corrective. This is because corrective controls are measures taken to eliminate or mitigate the impact of a detected threat or vulnerability. By automatically blocking malicious traffic, the firewall actively responds to a security event in real-time, taking corrective action to protect the network from potential harm.

This active intervention helps to restore the integrity of the system and prevent further damage by adapting its defenses based on the current threat landscape. In contrast, detective controls are used to identify or detect incidents that may already be occurring, while preventive controls are put in place to avoid incidents from happening in the first place. Deterrent controls aim to discourage potential attackers but do not take active measures to respond to threats as they occur.