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CISA and UK NCSC issue cybersecurity guidance on OT architecture

Source Decision Insights Threat Desk Published November 11, 2025 Companies 3
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3 companies named across 6 categories, one of 24 articles referencing Federal Bureau of Investigation. Previous coverage: Daily Intelligence Brief: Silicom, CISA, and NVIDIA developments - September 30, 2025 (Sep 2025).

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CISA, in collaboration with the Federal Bureau of Investigation, the United Kingdom’s National Cyber Security Centre, and other international partners has released new joint cybersecurity guidance: Creating and Maintaining a Definitive View of Your Operational technology (OT) Architecture.

Building on the recent Foundations for OT Cybersecurity: Asset Inventory Guidance for Owners and Operators, this guidance explains how organizations can leverage data sources, such as asset inventories and manufacturer-provided resources like software Bill of Materials (BOM) to establish and maintain an accurate, up-to-date view of their OT systems.

A definitive OT record enables organizations to conduct more comprehensive risk assessments, prioritize critical and exposed systems, and implement appropriate security controls. The guidance also addresses managing third-party risks, securing OT information, and designing effective architectural controls.

Key recommendations include:

  • Collaborating Across Teams: Foster coordination between OT and IT teams;
  • Aligning with Standards: Follow international standards such as Indirect Evaporative Cooling (IEC) 62443 and ISO/IEC 27001.

Organizations are encouraged to use this guidance to strengthen their OT security posture and reduce risks. For additional details, review the full guidance: Creating and Maintaining a Definitive View of Your OT Architecture

Blog post, originally published by CISA at cisa.gov.

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