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Shared control area · counts toward 1 standard
Cardholder data scoping
Cardholder data scoping is the process of identifying every system, person, and process that touches payment card data to define the Cardholder Data Environment (CDE). Frameworks require this because minimizing the footprint of sensitive data reduces the attack surface and simplifies the application of security controls.
Counts toward
Implement it once
- Create a detailed data flow diagram mapping the journey of card data from entry point to storage or transmission.
- Implement network segmentation using firewalls or VLANs to isolate payment systems from the rest of the corporate network.
- Maintain an inventory of all hardware, software, and third-party services that reside within the CDE.
- Deploy tokenization or redirection (e.g., iFrames) to ensure raw card data never touches internal servers.
- Establish a formal scoping policy that defines the boundaries of the payment environment and the frequency of scope reviews.
Evidence it produces
- Network diagrams showing clear segmentation boundaries between the CDE and non-payment networks.
- Documented data flow charts illustrating how cardholder data is captured, processed, and stored.
- An asset register listing all systems, devices, and personnel in scope for payment security.
- Segmentation validation reports (e.g., penetration test results) proving that out-of-scope systems cannot communicate with the CDE.
Where it counts
Defining a tight boundary once allows an organization to apply rigorous controls only where necessary rather than across the entire enterprise. This reduces the audit burden for any standard requiring sensitive data protection, as the assessor only needs to verify the limited area identified during scoping.