PCI DSS 10.4.2.1: Defining Periodic Log Review Frequency Based on Risk Analysis
Your organization's log review cadence directly impacts security incident detection and response time. PCI DSS 10.4.2.1 requires that you establish review frequencies grounded in your actual risk profile, not arbitrary schedules. Getting this right means fewer breaches slip through undetected.
What this means
PCI DSS 10.4.2.1 mandates that your entity document and justify the frequency at which security logs are reviewed periodically. This frequency must be derived from a formal risk analysis—not chosen arbitrarily. The control recognizes that different organizations face different threat landscapes; a high-risk e-commerce processor may need daily reviews while a lower-risk entity might justify weekly or monthly schedules. The key is that your chosen frequency aligns with identified threats, business criticality, and compensating controls.
How to comply
- 1.Conduct a documented risk analysis identifying threats specific to your cardholder data environment (CDE)
- 2.Map identified threats to log types and systems that would reveal compromise attempts or anomalies
- 3.Define review frequency for each log category (e.g., network logs daily, application logs weekly, access logs daily for critical systems)
- 4.Document the rationale linking your chosen frequency to risk severity and detection windows
- 5.Implement automated alerting for critical events to supplement scheduled manual reviews
- 6.Establish a baseline and monitor whether actual review frequency matches documented frequency
- 7.Review and update frequency annually or when risk profile changes
Evidence auditors look for
- Risk analysis document explicitly tying log review frequency to threat severity and business impact
- Log review schedule matrix showing different frequencies for different log types and systems
- Written policy stating review frequency for each CDE component with risk justification
- Documented deviation approvals if actual frequency exceeds planned frequency
- Audit trail confirming reviews occurred on the documented schedule
- Change log showing updates to review frequency when risk assessment changes
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
GRCWatch automates log aggregation and flags review gaps in real-time, ensuring your team meets the documented schedule while surfacing which logs actually need manual review based on your risk assessment—eliminating the guesswork from frequency decisions.
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