Walk through any manufacturing facility and you’ll find two different worlds working together every day. One keeps the business running through email, computers, and business software. The other keeps products moving down the production line using machines, sensors, and industrial control systems. Both are essential, and both have become targets for cybercriminals. The challenge is that protecting office computers is very different from protecting factory equipment. In this guide, we’ll explain the difference between IT security and OT security, why manufacturers need both, and how a stronger cybersecurity strategy can help prevent costly downtime.
What Is the Difference Between IT Security and OT Security?
IT security protects the data, accounts, and networks a business uses to communicate, store records, and run day-to-day operations. Think of it as a shield around your computers, email accounts, and business software. When a breach happens on the IT side, the main consequences are usually data theft, financial fraud, or a system that has to be taken offline and restored.
OT security is a different problem. It protects the physical systems and machines that actually manufacture things. In a typical facility, that means programmable logic controllers (PLCs), SCADA systems, industrial control systems (ICS), and the sensors connected to conveyor belts, robotic arms, and assembly equipment. When OT systems get hit, the damage goes well beyond lost files. A breach can stop an entire production line, damage physical equipment, or create safety risks for workers on the floor.
The biggest difference is what happens when something stops working. If an office computer goes offline for an hour, work slows down. If a machine controller goes offline, an entire production line could stop. That can delay customer orders, increase costs, and affect everyone from operators on the factory floor to customers waiting for deliveries.
Why OT Systems Are a Unique Security Challenge in Manufacturing
Most OT equipment in manufacturing was not designed with cybersecurity in mind. Machines and control systems on the factory floor were built to run for decades without stopping. Reliability and uptime were the priorities, not protection from hackers. As a result, a lot of OT equipment cannot receive regular software patches, runs on older communication protocols, and was never meant to connect to an outside network. A machine that was physically isolated from the internet was also largely safe from remote attack. The problem is that physical isolation is mostly gone now.
The Connectivity Problem Hitting Manufacturers Right Now
Over the last ten years, manufacturers have added significant connectivity to their facilities. Remote monitoring, cloud-based production analytics, supply chain portals, and digital integration tools have made factories faster and smarter. But they have also connected OT systems to IT networks, and through those IT networks, to the outside world.
That connection is now one of the most significant risks in manufacturing. According to the Fortinet 2025 State of Operational Technology and Cybersecurity Report, manufacturing was the single most targeted sector, accounting for 17% of all cyberattacks studied, and 50% of industrial organizations still experienced one or more security incidents in the past year. The most common attack methods were phishing and ransomware, both IT threats, that regularly end up disrupting production systems because the line between IT and OT networks is no longer clean.
How IT and OT Networks Are Colliding Inside Modern Factories
Ten years ago, a factory floor was largely separated from the corporate office network by design. That separation is mostly gone in modern manufacturing. Production scheduling software now pulls data from machines on the floor. ERP platforms integrate with equipment to track output. Remote access tools let technicians log into control systems from outside the plant. Third-party vendors connect through shared portals for maintenance and software support. Each connection serves a real purpose, and each one creates a potential path for an attacker.
One of the most common ways attackers take advantage of these connections is through ransomware. It often starts with something simple, like a phishing email or a stolen password. An attacker gains access to an employee’s computer, looks for ways to move through the network, and eventually reaches systems connected to production. Without proper network segmentation and continuous monitoring, what starts as an IT incident can quickly become an operational problem.
Vancord works with manufacturing clients on exactly this challenge. When we assess an organization’s ICS and OT environment, the most significant gaps are almost always at the connection points, where IT and OT meet and where visibility tends to disappear. When both environments are not monitored together, threats that start in an email inbox can move into control systems before anyone notices.
This is part of why manufacturing companies face such intense ransomware pressure. Attackers know that many manufacturers have reasonable IT defenses and significantly weaker OT defenses. Targeting the OT side through the IT side has become a common and effective strategy.
What Happens When an Attack Bridges Both Worlds
Here is what a real attack on a manufacturing network looks like. On a quiet weekend, while staff were away and nobody was watching the network internally, attackers began working through a U.S. manufacturer’s VPN with repeated login attempts. They had credentials and time on their side. From the outside, everything at the company looked completely normal.
Vancord’s Security Operations Center saw things differently. Analysts picked up the unusual authentication patterns, confirmed an active credential attack was underway, and shut the VPN down entirely, closing the attacker’s path before a single system was reached. By Monday morning, the attack was over. Identity controls were hardened across every division and multi-factor authentication was locked in before the first shift started. Zero systems compromised. Zero data accessed. Zero production downtime.
The full story of how that weekend attack was stopped before it became a breach is a clear picture of what 24/7 monitoring is actually worth when attackers decide a Saturday is the right time to strike.
With 24/7 SOC monitoring in place, suspicious activity gets investigated and contained before it ever reaches the production floor.
How Manufacturers Can Secure IT and OT Together
The encouraging finding from the Fortinet research is that progress is achievable and measurable. Organizations at the highest level of OT security maturity reported zero intrusions at a rate of 65%, compared to 46% at lower maturity levels. That gap reflects what focused security investment actually delivers in manufacturing.
Network segmentation is one of the most effective tools available. It keeps IT and OT systems separated at the network level while still allowing the data sharing manufacturers depend on. Traffic between the two sides is controlled, monitored, and limited to what is strictly necessary. An attacker who breaks into the office network cannot simply walk into the control systems on the other side.
Visibility is just as important. Many manufacturers discover they have very little insight into what is actually running on their OT networks. Equipment that has been in place for years may not appear in any current inventory. Knowing what devices are connected is the essential first step, and it is a core part of how manufacturers manage security monitoring without building an internal SOC.
Third-party access also deserves attention. A large share of OT environments depend on outside vendors for equipment servicing, software updates, and remote diagnostics. Those connections carry the same risk as any other entry point, and controlling them is a key part of Vancord’s supply chain cybersecurity approach for manufacturers.
Signs Your Manufacturing Environment May Be at Risk
Many manufacturers don’t realize they have security gaps until an incident occurs. Some common warning signs include:
- Production equipment connected directly to the business network.
- Shared user accounts for multiple employees.
- Older systems that haven’t been reviewed in years.
- Vendors with unrestricted remote access.
- No monitoring outside normal business hours.
Finding one or more of these issues doesn’t mean your organization has been compromised, but it does mean it’s worth reviewing your security posture before attackers find those same weaknesses.
Frequently Asked Questions: OT vs IT Security in Manufacturing
What does OT mean in manufacturing security?
OT stands for operational technology. In manufacturing, it covers the hardware and software that directly controls physical equipment: industrial control systems, SCADA systems, PLCs, and sensors on the production floor.
How is OT security different from IT security?
IT security protects data systems and business networks. OT security protects the physical systems that run a production environment. An IT breach typically affects data and access. An OT breach can stop a production line, damage machinery, or create safety risks.
Why is manufacturing such a common target for cyberattacks?
Production disruptions create immediate financial pressure. A factory that cannot ship products loses money fast, which makes paying ransom feel like the quicker path. Many OT systems also use older technology not built for today’s connected world, which makes them easier to exploit.
Can OT security and IT security be managed together?
Yes. A program that covers both environments gives teams full visibility across the entire network, which is how threats that move from IT to OT get caught early. Without that unified view, attackers can use one side to reach the other.
Does every manufacturer need OT security?
Yes. Any organization that relies on industrial equipment, automated production, or connected machinery should include OT security as part of its overall cybersecurity strategy.
Can ransomware spread from IT systems to OT systems?
Yes. If IT and OT networks are connected without proper security controls, attackers may move from office systems into production environments. Network segmentation, continuous monitoring, and strong access controls help reduce this risk.
Start Protecting Both Sides of Your Manufacturing Environment
Every manufacturer depends on technology to keep production moving. Office computers, industrial control systems, suppliers, and employees all play a role in daily operations. If one part of that environment is left unprotected, attackers can use it to reach another.
Protecting both IT and OT isn’t just about stopping cyberattacks. It’s about keeping production running, meeting customer deadlines, protecting employees, and avoiding the costly downtime that follows a successful attack.
Whether you’re strengthening your existing cybersecurity program or just starting to evaluate OT security, taking action today is far easier than recovering after an incident.
Contact our team to talk through where your IT and OT risks overlap, or request a security assessment and we will map the specific gaps in your environment before an attack does it for you.