How frequently should firewall and router rule sets be reviewed according to compliance standards?

Regularly reviewing firewall and router rule sets is essential for maintaining the security posture of an organization. Compliance standards typically recommend a frequency of at least every six months for this review. This timeframe allows organizations to ensure that their rule sets remain effective against evolving threats and adjust to changes in the network environment, such as new devices, applications, or compliance requirements.

By conducting these reviews biannually, organizations can identify and address any potential misconfigurations, outdated rules, or unnecessary permissions that may pose security risks. This not only aligns with best practices but also helps in maintaining compliance with various industry regulations that mandate regular assessments of security controls. In contrast, less frequent reviews could leave the organization vulnerable to security breaches, as the threat landscape and business environment can change rapidly.