IT/OT Convergence: Why Connecting Corporate And Operational Networks Creates New Risks

IT/OT convergence refers to the integration of information technology systems — corporate networks, cloud platforms, enterprise applications — with operational technology systems — industrial control systems, SCADA, PLCs, and connected operational devices.

The drivers of convergence are largely commercial. Organizations want to:

• Access real-time operational data for analytics and decision-making
• Enable remote monitoring and management of industrial systems
• Integrate OT performance data with enterprise resource planning (ERP) platforms
• Reduce operational costs through centralized management and automation
• Support digital transformation initiatives that span both IT and operational environments

These are legitimate business objectives. But connecting previously isolated OT environments to corporate networks — and in many cases, to the internet — introduces security risks that many organizations are not adequately prepared to manage.

The Loss of Air-Gap Protection

Historically, the air gap — physical network separation between IT and OT — was the primary security control protecting industrial environments. A system that is not connected to an external network cannot be attacked remotely.

Convergence eliminates this protection. Once OT systems are connected to corporate IT networks, they become reachable from anywhere that IT network is reachable — including from the internet, from cloud services, and from any device connected to the corporate environment.

This does not make convergence inherently wrong. But it does mean that the security controls previously provided by isolation must be replaced with active, monitored defenses — a transition many organizations have not fully made.

Lateral Movement Between Domains

The most significant security risk introduced by IT/OT convergence is the creation of pathways for lateral movement between domains.

An attacker who gains access to the corporate IT network — through a phishing email, a compromised user account, or a vulnerable internet-facing service — can potentially reach OT systems if adequate segmentation and monitoring are not in place.

Conversely, a compromised IoT or OT device connected to the corporate network can serve as a foothold for attacks against IT infrastructure — including the deployment of ransomware, exfiltration of sensitive data, or compromise of identity platforms.

In converged environments, a breach anywhere can become a breach everywhere — if the right controls are not in place.

Learn more: IoT Ransomware: How Attacks on Connected Devices Are Evolving

OT Systems Were Not Designed for Network Exposure

Industrial control systems were designed for reliability, determinism, and longevity — not for security in networked environments. Many OT systems:

• Run operating systems that are no longer supported or patchable
• Use industrial protocols with no built-in authentication or encryption
• Were sized for processing power appropriate to their control function, with no capacity for security tooling
• Cannot tolerate the network scanning, active probing, or agent deployment that standard IT security tools use

Connecting these systems to corporate networks exposes vulnerabilities that were previously theoretical — because the systems were never reachable. Convergence makes those vulnerabilities real and exploitable.

Expanded Attack Surface for IoT Devices

IT/OT convergence does not only affect industrial control systems. It also draws IoT devices — sensors, building management systems, smart meters, connected operational equipment — into the same network environment as corporate IT infrastructure.

Each of these devices adds to the attack surface of the converged environment. Many have the same inherent security limitations as OT systems — limited patching capability, no agent support, legacy protocols — but are deployed at far greater scale and with even less security oversight.

Learn more: The IoT Attack Surface: How Many Devices Are Really at Risk?

Nation-state actors and ransomware groups have both demonstrated the ability and intent to exploit IT/OT convergence.

IT-side initial access is the most common entry point. Attackers compromise corporate IT infrastructure — through phishing, credential theft, or exploitation of internet-facing services — and then use that access to map the converged environment and identify OT and IoT targets.

Exploitation of integration pathways targets the specific connections between IT and OT systems — data historians, remote access platforms, engineering workstations, and OT management interfaces — that are the functional purpose of convergence but also represent the security boundary between domains.

Living-off-the-land techniques allow sophisticated attackers to move through converged environments using legitimate tools and credentials — making their activity difficult to distinguish from normal administrative operations.

Targeting of remote access infrastructure has increased significantly as remote monitoring and management of OT systems has expanded. VPNs, remote desktop platforms, and vendor access portals connecting IT to OT environments are high-value targets for attackers seeking to cross the IT/OT boundary.