PCI DSS Requirement 1: Install & Maintain Network Security Controls
Blog post from Basis Theory
PCI DSS Requirement 1 requires organizations to install and maintain network security controls, chiefly firewalls and network segmentation, to protect cardholder data within a defined Cardholder Data Environment (CDE). It emphasizes documented responsibilities, firewall configuration standards, traffic logging, and regular reviews to ensure that only authorized inbound and outbound traffic can reach the CDE, including traffic from wireless networks. PCI DSS v4.0 adds requirements to isolate the CDE from untrusted networks through controlled connections, anti-spoofing protections, limits on direct access to systems storing cardholder data, and restricted exposure of internal network information. It also requires security measures for devices that connect both to untrusted networks and the CDE, with controls that actively prevent threats and cannot be changed without authorized approval. The passage presents Basis Theory as a PCI Level 1-compliant provider that offers an externally assessed CDE and tokenization tools intended to help businesses secure payment data while reducing their own PCI compliance scope, while noting that official PCI SSC materials remain the authoritative source for current requirements.
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