Industrial Network Security
OT/IT network segmentation review and industrial protocol security assessment.
Industrial Network Security
The convergence of Operational Technology and Information Technology networks is accelerating across every industrial sector — driven by Industry 4.0 initiatives, remote monitoring requirements, and supply chain integration. While this convergence delivers operational efficiency, it fundamentally transforms the risk landscape of environments that were designed for reliability and safety, not cyber resilience. Intelliroot's Industrial Network Security service provides a comprehensive review of your OT/IT convergence architecture, identifying vulnerabilities that expose production systems to enterprise-originating threats.
Our specialists evaluate industrial network architectures against IEC 62443 zone and conduit principles, reviewing DMZ design, firewall rulesets, industrial protocol exposure, and passive monitoring coverage. We also examine wireless deployments, supply chain connectivity, and the security of industrial equipment procurement processes — addressing the full perimeter of a modern industrial network environment.
Why Industrial Network Security Is Foundational
IT/OT Convergence Creates New Attack Paths
Every new connection between enterprise IT and the OT network is a potential attack path. Without proper industrial DMZ design and rigorous firewall rules, a ransomware infection in the enterprise domain can cross into the production floor within minutes.
Industrial Protocols Were Not Designed for Security
Modbus, DNP3, Profibus, and BACnet were designed for reliability and determinism — not security. They have no authentication, no encryption, and no authorisation. Exposed on a converged network, they present trivial exploitation opportunities for any attacker with network access.
Industrial Wireless Deployments Are Often Unsecured
Wireless sensors, WirelessHART, ISA100.11a, and Wi-Fi-connected HMIs deployed for operational convenience frequently lack adequate encryption, authentication, or RF monitoring — providing physical perimeter bypass opportunities for attackers in proximity to industrial sites.
Supply Chain Threats Target Industrial Equipment
Adversaries increasingly target the industrial equipment supply chain — embedding malicious firmware, unauthorised wireless modules, or backdoors in components that bypass perimeter security entirely. Supply chain security for industrial procurement requires a dedicated assessment process.
What We Assess
OT/IT Convergence & DMZ Architecture
- Industrial DMZ design review and gap analysis
- IT/OT boundary firewall rule analysis
- Data diode and unidirectional gateway assessment
- Jump server and bastion host security review
- Remote access path enumeration and risk assessment
Network Segmentation & Protocol Analysis
- IEC 62443 zone and conduit model validation
- VLAN and network segment boundary testing
- Industrial protocol exposure analysis (Modbus, DNP3, EtherNet/IP)
- Passive traffic analysis for anomalous communication
- Broadcast storm and storm control review for OT segments
Wireless Security in Industrial Environments
- Wi-Fi network assessment for OT-adjacent deployments
- WirelessHART and ISA100 security review
- Rogue access point detection
- Bluetooth and Zigbee device enumeration
- RF monitoring and spectrum assessment
Supply Chain & Vendor Security
- Industrial equipment procurement security review
- Vendor remote access governance assessment
- Firmware integrity verification procedures
- Supply chain risk register review
- Third-party maintenance access controls
Our Assessment Approach
Scoping & Architecture Discovery
Collect existing network diagrams, asset registers, firewall configuration exports, and zone documentation. Conduct stakeholder interviews with OT engineers, network architects, and operations personnel to establish a complete picture of the industrial network environment.
Passive Network Monitoring Deployment
Deploy passive monitoring sensors at key aggregation points across OT network zones to build a ground-truth asset inventory, map all communication flows, and identify undocumented connections — particularly between OT zones and corporate IT infrastructure.
Firewall & Segmentation Review
Conduct a detailed review of all firewall rules, ACLs, and routing configurations at OT/IT boundaries, DMZ interfaces, and zone conduit points. Identify overly permissive rules, unused legacy rules, and protocol exposure inconsistent with the IEC 62443 zone model.
Protocol Analysis & Wireless Assessment
Analyse captured industrial protocol traffic for unauthenticated command execution exposure, cleartext transmission of sensitive data, and abnormal communication patterns. Conduct RF survey and wireless security assessment of all OT-adjacent wireless deployments.
Risk Reporting & Architecture Recommendations
Deliver findings mapped to IEC 62443 zone and conduit requirements, with architectural recommendations for industrial DMZ design, protocol security controls, and supply chain governance improvements. Provide a prioritised remediation roadmap with implementation sequencing.
Frequently Asked Questions
Deliverables
Industrial Network Security Report
Comprehensive findings covering OT/IT convergence risks, DMZ gaps, protocol exposure, wireless vulnerabilities, and supply chain security observations.
Annotated Network Architecture Diagram
Revised network topology annotated with zone boundaries, identified gaps in segmentation, undocumented connections, and recommended control insertion points.
IEC 62443 Zone & Conduit Assessment
Evaluation of existing zone and conduit design against IEC 62443-3-3 requirements with maturity scoring and recommended redesign guidance.
Firewall Rule Review Report
Detailed analysis of OT-facing firewall rulesets identifying overly permissive rules, unused legacy entries, and protocol exposures requiring remediation.
Remediation & Architecture Roadmap
Prioritised roadmap for network segmentation improvements, DMZ redesign, protocol controls, and supply chain governance enhancements.
Request a Security Assessment
Tell us about your environment and security objectives. We'll design a bespoke assessment and deliver a detailed proposal within 48 hours.