How often should security assessments be conducted according to PCI DSS?

According to the PCI DSS, security assessments should be performed at least annually and after any significant changes to the network. Conducting assessments annually ensures that organizations regularly evaluate their security measures, identify vulnerabilities, and implement necessary updates to maintain compliance with the standards.

The stipulation to reassess after significant changes is crucial, as it allows organizations to address new risks that may arise from alterations in their infrastructure, such as changes in technology, processes, or personnel. This proactive approach helps safeguard cardholder data and maintain the integrity of payment card transactions.

By focusing on these timeframes, the PCI DSS emphasizes the importance of ongoing vigilance and adaptation to evolving security challenges rather than relying on infrequent or outdated assessments.