Federal OT Zero-Trust Guidance Raises Governance Bar
OT zero trust is no longer a theory exercise. The new guidance treats visibility, identity, segmentation, and supply-chain control as the minimum for environments that cannot absorb downtime or unsafe change. The standard IT response — bolt on a perimeter tool and call it done — misses that OT security has to preserve physical process stability first.
CISA led the 28-page guide with the FBI, Defense, Energy, and State departments. It maps zero-trust practices to OT constraints and centers governance, asset inventory, change tracking, secure remote access, vulnerability management, encryption, and supply-chain risk management tools such as software bills of materials. The document is aimed at critical infrastructure operators facing legacy systems, limited visibility, and expanding attack surfaces from IT/OT convergence.
The practical effect is a higher bar for operators and vendors. Federal expectations are shifting toward provable oversight of assets, access, and suppliers, and that pressure will show up in procurement, audits, and architecture reviews.