Industrial organisations have always had exposure points. In the past, these were just physical. Doors, gates, access points into facilities etc. These entry points still exist, but they have been joined by something far more complex and often far less visible. The digital attack surface.
In Operational Technology (OT) environments, this attack surface is not confined to a single system or network. It spans industrial control systems, legacy infrastructure, remote connections, and the growing convergence between IT and OT. As these environments become more connected, the number of potential entry points increases, along with the difficulty of managing them.
The threat landscape has shifted significantly. According to industry data, 72% of industrial cyber incidents now originate in IT environments before moving laterally into OT systems. At the same time, 70% of industrial organisations report experiencing cyber attacks, with some facing repeated or even daily incidents.
The attack surface is expanding. The question is whether organisations have full visibility of it.
At its core, the OT attack surface is the sum of all the points where an attacker could gain access to your operational environment.
This includes both known and unknown vulnerabilities, as well as every connection, system, and service that interacts with your OT network.
Unlike IT environments, where assets are often well documented and regularly updated, OT environments are typically more complex. Systems may have been in place for decades. Documentation can be incomplete. Changes are made over time without always being centrally tracked.
The result is an environment where risk is not always visible.
Even when organisations have clear visibility of physical devices such as PLCs, HMIs, and RTUs, the true attack surface extends far beyond this. It exists within software layers, firmware, communications protocols, and network connections.
For large organisations operating across multiple sites, this complexity increases significantly.
One of the most consistent issues in OT security is not a lack of controls, but a lack of visibility.
Many organisations do not have a complete and up-to-date inventory of their OT assets. Without this, it becomes extremely difficult to identify exposures, detect anomalies, or respond effectively to threats.
This is compounded by common weaknesses seen across industrial environments, including:
These issues are not new. What has changed is how they are being exploited.
Threat actors are increasingly targeting these gaps, using them as entry points to move across environments and disrupt operations.
Reducing your attack surface is not a one-time activity. It is a continuous process that requires a structured and proactive approach.
It begins with visibility. Understanding what assets exist within your environment, how they are connected, and where exposures may lie.
From there, organisations can begin to prioritise risk. Not all vulnerabilities carry the same level of impact, particularly in OT environments where operational dependencies must be considered.
Key steps include:
However, unlike IT environments, these activities must be carried out carefully. OT systems are often sensitive to disruption, and traditional scanning or patching approaches can introduce operational risk.
This is why a specialised OT approach is essential.
Securing an OT environment is fundamentally different from securing IT.
In IT, aggressive scanning and rapid patching are standard practices. In OT, these same approaches can disrupt systems, impact production, or even create safety risks.
OT environments prioritise availability and safety above all else. Systems often run continuously and may rely on legacy technology that cannot be easily updated.
This creates a unique challenge. Organisations must reduce risk without compromising operations.
It also means that security must be designed with the environment in mind, rather than applied as an afterthought.
Managing and reducing the OT attack surface requires more than tools. It requires expertise, structure, and a deep understanding of industrial environments.
Integrity360’s OT Security services are designed to provide that.
Through a combination of OT security auditing, consulting, engineering, investigations, and awareness training, we help organisations gain full visibility of their environments, identify exposures, and implement practical, risk-led improvements.
Our approach is holistic. We secure IT and OT environments together, preventing threats from moving across boundaries and ensuring that security measures are aligned to operational priorities.
We work with organisations across sectors including energy, manufacturing, and critical infrastructure, applying globally recognised frameworks such as IEC 62443, ISO 27001, and NIST to deliver effective outcomes.
The result is not just improved security, but greater resilience.
If you need a clearer view of your OT environment and the exposures within it, our specialists can help.