How frequently must Cyber Security Incident response plans be tested?

Cyber Security Incident Response Plans (CIRPs) must be tested at least every 15 months to ensure that they are effective and up to date. This requirement is rooted in the need for organizations to regularly assess their ability to respond to cyber security incidents in a timely and efficient manner. Testing the CIRPs helps identify any weaknesses or gaps in the response strategy, allowing organizations to make necessary updates and improvements.

By conducting these tests at least annually, organizations can ensure preparedness, enhance their incident response capabilities, and comply with regulatory standards set forth by entities like NERC (North American Electric Reliability Corporation). This regular testing is crucial in the rapidly changing landscape of cyber threats, where vulnerabilities and best practices can change quickly, necessitating frequent evaluations of response strategies.