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 Insight
If the boundary fails, you are already in incident response mode.
Final Thought: Boundaries Define Trust—Not Intent
Many OT incidents occur because organizations trusted the boundary to hold rather than verifying that it could. Obsolete devices, weak authentication, and static configurations turn boundaries into soft targets.
For CISOs, boundary hardening is one of the few areas where modernization delivers immediate risk reduction without disrupting operations. If the boundary cannot adapt, the organization cannot defend itself as threats evolve.
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