OT risk management: what CISOs need to change now

TL;DR: OT environments now carry cyber risk that can affect safety, availability and physical operations, and Nozomi Networks argues that traditional IT security tools are not enough because legacy devices, limited patch windows and IT/OT convergence change the control problem. Continuous monitoring and full asset visibility become the decisive controls when patching cannot happen fast enough.

Editorial analysis by NHI Mgmt Group, based on content published by Nozomi Networks: “A CISO’s Guide to OT Security & Risk Management”.

Key questions

Q: How should teams prioritise OT vulnerabilities after discovery?

A: Teams should prioritise OT vulnerabilities by operational dependency, safety impact, and remediation feasibility, not by vulnerability count alone.

Q: Why do OT environments need different risk management than IT environments?

A: OT environments control physical processes, so the security outcome includes safety and operational continuity, not just data protection.

Q: What breaks when OT asset inventory is incomplete?

A: Incomplete OT asset inventory breaks segmentation, vulnerability prioritisation, and incident response because security teams cannot reliably tell which devices exist, where they are, or what they connect to.

Practitioner guidance

• Build an OT-safe asset inventory Map PLCs, SCADA systems, IoT sensors, building systems and remote access paths using discovery methods that do not disrupt live processes.
• Separate OT risk scoring from IT triage Weight safety, availability and environmental consequence above generic likelihood so remediation decisions reflect the real blast radius.
• Use passive monitoring as the interim control Track device and network anomalies continuously so you can detect unsafe changes before the next scheduled maintenance window.

Bottom line: OT risk management has to be built around physical consequence, not IT-style confidentiality assumptions.

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