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Industrial digitalisation has radically changed the way organisations produce, monitor and make decisions. Factories no longer work as technology islands. Industrial control systems exchange information with ERP platforms, cloud applications, predictive maintenance tools, artificial intelligence solutions and corporate dashboards. This convergence of IT and OT has opened up huge opportunities to improve productivity, but it has also widened an attack surface that barely existed a few years ago.
Paradoxically, many organisations still approach industrial cybersecurity with a mindset inherited from another era. They protect the corporate perimeter while assuming the production network is still an isolated environment, when reality shows exactly the opposite. Today it is common to find plants where PLCs, SCADA, HMIs, IoT sensors, MES systems and industrial servers keep permanent connections to corporate networks, external suppliers or remote services.
The problem is not usually a lack of technology. Most of the time, breaches appear because of seemingly small decisions that pile up over the years: a password that was never changed, remote access left open for a supplier, a device that stopped receiving updates or network segmentation that was never put in place.
Most serious incidents do not start with sophisticated attacks worthy of a film. They begin with everyday mistakes that go unnoticed because "that's how it's always been done".
Understanding those mistakes is the first step to reducing operational risk and protecting one of any organisation's most valuable assets: business continuity.
OT cybersecurity can no longer be treated as an isolated project
For many years there was a clear separation between IT departments and production managers. While IT protected corporate information, OT focused on making sure the plant never stopped.
That model is no longer valid.
Today, any technology decision ends up affecting both worlds. A server update can change an industrial process. A new VPN connection can open a way into the production network. Even a simple maintenance laptop can become the vehicle that compromises an entire installation.
That is why OT cybersecurity is no longer just about installing an industrial firewall. It requires understanding how information flows, who accesses each system, what dependencies exist between devices and what the real consequences of an interruption would be.
In sectors such as manufacturing, energy, transport, food, pharmaceuticals or critical infrastructure, the main goal is not only to protect data. The priority is to keep operations running safely, stably and continuously.
Mistake number one: thinking the plant is isolated
This is probably the most widespread false sense of security.
Many organisations are still convinced their industrial network is completely separate from the outside world. Yet when a technical audit is carried out, it reveals connections to suppliers, old VPN access, shared servers, engineering workstations connected to the internet or even IoT devices sending information directly to cloud platforms.
Every new connection can become a new attack vector.
Reality shows that very few industrial plants today operate in completely isolated environments. The need for remote supervision, predictive maintenance, manufacturer support or integration with corporate systems means that absolute separation has practically disappeared.
The first step is precisely to accept this new reality.
Mistake number two: not knowing all the existing OT assets
A seemingly simple question often produces surprising answers.
How many industrial devices are there really in the plant?
In many organisations nobody can answer precisely.
Old PLCs, forgotten industrial switches, undocumented engineering workstations, legacy servers or equipment installed by suppliers years ago whose existence hardly anyone remembers often turn up.
What you do not know about cannot be protected.
Visibility is one of the fundamental pillars of any modern OT cybersecurity strategy. Before implementing controls, you need an up-to-date inventory that identifies devices, firmware versions, operating systems, communications, operational criticality and the owner of each asset.
This seemingly administrative exercise often uncovers risks unknown even to organisations with high levels of technology maturity.
Mistake number three: using the same passwords for years
Production can never stop.
That argument, completely understandable from an operational point of view, has led to credentials being kept for years without ever being changed.
It is still relatively common to find accounts shared between different technicians, manufacturers' default passwords or even passwords written down next to the machines to make urgent interventions easier.
When an attacker gets hold of a valid credential, many security measures stop having any effect.
Identity management in OT environments must adapt to industrial reality without giving up basic principles such as multi-factor authentication where feasible, regular credential rotation, removing obsolete accounts and full traceability of who accesses each system.
Mistake number four: allowing remote access without enough control
Remote assistance has transformed industrial maintenance.
Manufacturers, integrators and suppliers can solve incidents without travelling to the plant, cutting response times and operating costs.
However, that convenience also introduces new risks.
Every permanent remote access is a potential way in.
Many organisations do not know how many suppliers keep active connections, who supervises them or whether they stay open even when nobody is using them.
Current best practice favours temporary access, on-demand authorisation, complete activity logs and specific segmentation for external suppliers.
The philosophy should be simple: no access should remain available unless there is an immediate operational need.
Mistake number five: not segmenting industrial networks properly
One of the most important principles of cybersecurity is to prevent a localised incident from spreading to the rest of the organisation.
When the whole infrastructure shares the same network, any infection can move laterally very quickly.
Segmentation is not meant to complicate day-to-day work.
Its real purpose is to limit the impact of any incident.
Separating corporate networks, industrial zones, SCADA servers, engineering workstations, IoT devices and external access makes it possible to contain threats before they affect critical processes.
This approach is especially relevant in organisations with multiple plants, logistics centres or distributed infrastructure.
Mistake number six: putting off updates indefinitely
In industrial environments there is a reasonable fear of any change.
Updating a critical system can affect production availability.
As a result, many organisations choose practically never to update.
The problem arises when obsolete operating systems, old software versions or widely known vulnerabilities remain exposed for years.
Not every update has to be installed immediately.
But every one should be assessed.
A mature strategy combines validation labs, planned maintenance windows, impact analysis and rollback procedures that maintain stability without giving up on reducing risk.
Mistake number seven: assuming backups are enough
Many companies believe they are protected because they make backups.
The real question is a different one.
Could they fully restore production if they were hit by ransomware tomorrow?
The answer is not always yes.
Backups often do not include PLC configurations, production recipes, SCADA projects, firmware, network configurations or specific systems that are essential to restart operations.
An industrial recovery strategy must cover both the information and the real ability to get back to production within times the business can accept.
Operational continuity depends as much on recovery capability as on prevention.
Mistake number eight: forgetting the human factor
Technology can reduce much of the risk, but it is still impossible to eliminate the human component completely.
Engineers, operators, maintenance technicians and external staff interact with critical systems every day.
An unauthorised USB device, a session left open for hours or a phishing email aimed at technical staff can trigger a high-impact incident.
Training specific to OT environments is still one of the most cost-effective investments.
It is not about turning every professional into a cybersecurity expert.
It is about building a culture in which everyone understands how certain actions can directly affect industrial continuity.
Mistake number nine: acting only when an incident occurs
Many cybersecurity investments come too late.
The trigger is usually an audit, a regulatory requirement, an attack on another company in the sector or an internal incident.
However, cybersecurity maturity is built before problems appear.
The most resilient organisations keep continuous processes of review, risk analysis, drills, monitoring, vulnerability assessment and constant improvement.
Security stops being a project with a start and end date and becomes a permanent capability of the organisation.
Mistake number ten: believing OT cybersecurity is only the technical department's job
This is probably the most important mistake of all.
Industrial protection cannot rest solely on the automation manager or the IT department.
Decisions about investment, business continuity, risk management, regulatory compliance and digital transformation directly involve the company's management.
OT cybersecurity must be part of the corporate strategy.
When management understands that a production stoppage can mean millions in losses, contractual breaches or reputational damage, the conversation stops being only about technology and starts being about business.
That change of focus is decisive.
The new regulatory landscape demands a higher level of protection
The evolution of European regulation is accelerating this cultural change.
Directives such as NIS2 and other regulations on critical infrastructure significantly raise the requirements for risk management, governance, resilience and incident response.
However, limiting cybersecurity to regulatory compliance would be a mistake.
The most advanced companies understand that protecting OT environments is not just about complying with a regulation, but about preserving the ability to keep producing even when an incident occurs.
Resilience thus becomes a competitive factor.
IT/OT convergence demands new management models
One of today's great challenges is coordinating teams with historically different priorities.
While IT seeks the confidentiality, integrity and availability of information, OT prioritises the continuity of production and the physical safety of people and facilities.
Both goals must coexist.
This requires specific methodologies, architectures designed for industrial environments, coordinated processes and an overall view that takes in both the technology infrastructure and business processes.
The organisations that evolve best are those able to break down the traditional barriers between departments and build multidisciplinary teams where engineering, operations, security and management work under a common strategy.
Turning OT cybersecurity into a competitive advantage
For years, cybersecurity was seen as an unavoidable cost.
Today it is starting to be understood as something that improves operational reliability, increases the trust of customers and technology partners, makes regulatory compliance easier and significantly reduces the financial risk associated with production interruptions.
The industrial organisations that will lead the next decade will not necessarily be those that adopt the most technology.
They will be those able to manage it most securely.
In this context, having a specialised technology partner is especially relevant. Protecting industrial infrastructure requires experience in both IT and OT technologies, the ability to design resilient architectures, continuous monitoring, managed services and a deep understanding of industrial processes.
At Motum Technologies we work precisely from that integrated perspective. Our teams help industrial, energy, healthcare, logistics and critical infrastructure organisations design cybersecurity strategies adapted to the operational reality of each environment. From the initial risk assessment to implementing secure architectures, network segmentation, continuous monitoring and 24x7 Smart Managed Services, the goal is always the same: to protect business continuity without compromising productivity.
Because in OT cybersecurity, the question is no longer whether an organisation will face attack attempts.
The real difference will be its ability to withstand them, contain them and keep operating normally.