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Brian Weidner

Brian Weidner

Hardening the OT Boundary: A Control CISOs Cannot Delegate

Hardening the OT Boundary: A Control CISOs Cannot Delegate

Most OT breaches succeed because boundaries fail. The OT boundary is often the only layer that can be modernized without impacting production systems. Boundary Controls CISOs Should Mandate • Modern, patchable firewalls • MFA for all external human access • Least-privilege enforcement • Removal of default credentials • Secure-by-design boundary devices Executive

Designing OT Networks to Contain Breaches, Not Pretend They Won’t Happen

Designing OT Networks to Contain Breaches, Not Pretend They Won’t Happen

Assuming perfect prevention is not a strategy. This principle focuses on blast-radius reduction, a concept CISOs understand well. Board-Level Risk Controls • Segmentation and micro-segmentation • Separation of duties • Elimination of flat networks • Restrictions on lateral movement Executive Insight Resilience is defined by how much damage an attacker can

Why CISOs Should Centralize OT Connectivity Before It Becomes Unmanageable

Why CISOs Should Centralize OT Connectivity Before It Becomes Unmanageable

Decentralized connectivity results in fragmented controls, inconsistent monitoring, and invisible risk. The guidance strongly favors centralization and standardization as a strategic control mechanism. CISO Benefits • Fewer ingress points to govern • Consistent enforcement of security policy • Centralized logging and auditability • Simplified third-party risk management A single hardened connectivity pattern is

Protocol Risk Is Business Risk: What CISOs Need to Know About OT Communications

Protocol Risk Is Business Risk: What CISOs Need to Know About OT Communications

Protocols define how trust is enforced—or ignored. Many OT protocols were not designed to prevent tampering or impersonation. Secure connectivity requires upgrading not just networks, but communication semantics. CISO-Level Expectations • Authenticated protocols by default • Encryption at trust boundaries • Roadmaps away from insecure legacy protocols • Explicit risk acceptance where

Minimizing OT Attack Surface: A CISO’s Perspective on Limiting Exposure

Minimizing OT Attack Surface: A CISO’s Perspective on Limiting Exposure

Exposure is the single most reliable predictor of OT compromise. The more reachable an asset is, the more likely it will be targeted. CISOs must therefore champion exposure management, not perimeter optimism. High-Risk Exposure Patterns • Internet-accessible OT devices • Inbound remote access • Permanently enabled vendor connections • Admin interfaces outside

OT Connectivity Governance: Why CISOs Must Require a Business Case for Every Connection

OT Connectivity Governance: Why CISOs Must Require a Business Case for Every Connection

From a CISO standpoint, uncontrolled connectivity equals uncontrolled risk. The NCSC guidance is explicit: every OT connection must be justified by a documented business case. This requirement establishes governance discipline and audit ability. What CISOs Should Demand Each connectivity request should define: * Operational necessity * Business value * Acceptable cyber and safety

Secure OT Connectivity: A CISO’s Guide to Reducing Cyber Risk Without Disrupting Operations

Secure OT Connectivity: A CISO’s Guide to Reducing Cyber Risk Without Disrupting Operations

Operational Technology connectivity is now a board-level risk issue. OT environments were historically engineered for safety and uptime, not cyber threat exposure. Today, increased digitization, remote access, and third-party integration have transformed OT connectivity into one of the most consequential cyber risk surfaces in the enterprise. The National