Key Takeaways
- Last year, CISA published more than 500 ICS advisories for the first time in the history of the program. Of those, 82% carried a high or critical severity rating.
- Most OT security exposures in mid-size Ohio manufacturing operations trace back to unresolved IT-OT convergence: connections added for operational convenience that were never reviewed for security risk.
- Ohio manufacturers in the defense supply chain face an active CMMC compliance timeline. Requirements began appearing in DoD contracts November 10, 2025, and CMMC compliance becomes mandatory for all new DoD contracts by October 31, 2026.
- IEC 62443 is the operational security standard for the broader industrial space, increasingly referenced by insurers, OEM vendors, and procurement teams when evaluating supplier risk.
- An effective industrial cybersecurity solution starts with network visibility. Without an accurate inventory of what’s on your OT network, monitoring and segmentation have no foundation to build from.
Your plant floor looks different from what it did ten years ago.
Equipment that once ran on isolated networks now connects to ERP systems, vendor portals, and remote monitoring platforms. That connectivity improves efficiency, but it expands your attack surface in ways most operational teams haven’t fully mapped.
Industrial cybersecurity isn’t a new concept, but the urgency around it has changed.
For Ohio manufacturers, the question is whether your current environment is built to handle what’s being directed at industrial systems right now.
Why Industrial Cybersecurity Has Become an Operational Priority for Manufacturers
The scale and severity of cyber attacks in industrial manufacturing settings are only growing.
For the first time since the Cybersecurity and Infrastructure Security Agency (CISA) launched its Industrial Control System (ICS) advisory program, more than 500 advisories were published in a single year. 2025 saw 508 advisories covering 2,155 common vulnerabilities and exposures (CVEs) across more than 200 vendors and 700 products. Of those advisories, 82% carried a high or critical severity rating, according to Forescout’s ICS Cybersecurity 2026 analysis.
What makes industrial environments particularly exposed isn’t just the volume of advisories. It’s the nature of the systems they affect. Programmable Logic Controllers (PLCs), Supervisory Control and Data Acquisition (SCADA) platforms, Human-Machine Interfaces (HMIs), and distributed control systems were engineered for reliability and operational longevity, not for a connected threat environment. Many run for years without a patch cycle and communicate over protocols that most IT security tools can’t read.
When those systems are compromised, the impact is a halted production line, a safety system that fails to respond, or a delivery commitment that can’t be met.
What Factors Make Your Plant’s Network Particularly Exposed?
The shift happened gradually at most Ohio facilities. A plant manager wanted real-time production data accessible from the front office. A vendor needed remote access to service a piece of equipment. An ERP migration required connecting the shop floor to the business network.
Each decision made operational sense at the time. Taken together, they created connections between operational technology and business systems that weren’t designed to share a network, and most were never reviewed for security implications before they went live.
Ohio’s manufacturing base gives a specific texture to this problem:
A steel service center with connected laser cutters and press brakes
A precision machining shop that added remote monitoring to meet a Tier 1 automotive customer’s visibility requirements
A contract manufacturer that tied scheduling software directly to the shop floor.
In each case, the operational technology (OT) environment grew more connected before anyone assessed whether the security posture could support that growth.
The pattern Rea sees consistently in manufacturing engagements across Ohio is that most operations are aware of the risk. What they lack is a current, accurate picture of what’s actually running on their network and how it connects.
The Compliance Landscape Ohio Industrial Manufacturers Are Navigating
Two security frameworks are shaping how Ohio manufacturers approach their industrial cybersecurity compliance posture: CMMC for those in the defense supply chain and IEC 62443 for the broader industrial space.
Both reflect that customers, insurers, and regulators are treating OT security as a documented, verifiable program.
Cybersecurity Maturity Model Certification and the Defense Supply Chain
The Cybersecurity Maturity Model Certification (CMMC) Final Rule took effect in December 2024. Requirements began appearing in DoD solicitations on November 10, 2025, and CMMC compliance becomes mandatory across all new DoD contracts by October 31, 2026.
For most defense supply chain manufacturers, Level 2 certification is required, aligned to the 110 controls in the National Institute of Standards and Technology (NIST) SP 800-171. The assessment and remediation process typically takes six months to over a year, depending on your existing posture. If your operation handles controlled unclassified information and hasn’t started, the runway is already short.
International Electrotechnical Commission (IEC) 62443 and Industrial Automation Security
For manufacturers outside the defense supply chain, IEC 62443, developed by the International Society of Automation, is the recognized international standard for cybersecurity across industrial automation and control systems. It defines security zones, establishes communication requirements between systems, and sets access control expectations for OT environments.
Where CMMC sets a contract eligibility bar, IEC 62443 sets the operational security benchmark for how your industrial environment is designed and managed. Insurers and procurement teams are referencing it more frequently when evaluating supplier risk, signaling that alignment is moving beyond voluntary.
What an Industrial Cybersecurity Solution Actually Needs to Do
An industrial cybersecurity solution isn’t a product you purchase and deploy. It’s a program of controls, monitoring, and response capabilities built to match the specific architecture of your environment. For most mid-size Ohio manufacturers, that program starts with three foundational areas.
Network visibility comes first. You can’t protect what you haven’t inventoried. Most OT environments contain equipment that IT teams have never catalogued, including legacy PLCs communicating over proprietary protocols, HMIs running outdated operating systems, and remote access paths opened for vendor maintenance that were never closed. An accurate asset inventory, even an incomplete one, changes what you can monitor and respond to.
Segmentation is the next critical layer. Keeping OT traffic isolated from IT traffic limits how far an attacker can move after gaining a foothold through the business network. It reduces the likelihood that ransomware on an office workstation can propagate to a production system.
From there, continuous monitoring and a documented incident response plan convert a passive security posture into an active one. The IT support infrastructure underlying manufacturing operations determines how quickly an operation can detect, contain, and recover when an incident occurs, and that speed is often the difference between a contained event and a protracted shutdown.
Build a Security Foundation Your Operations Can Run On
Ohio manufacturers are running more connected operations in a more actively contested environment. Industrial cybersecurity is a program that evolves with your environment, adapts to new compliance requirements, and reflects what your operation genuinely cannot afford to lose.
Rea Information Services works with Ohio manufacturers to assess, build, and manage security programs designed for operational technology environments. Whether your team is responding to a compliance deadline, working through a concern raised internally, or getting ahead of risk before it becomes an incident, the right starting point is a clear-eyed view of where you currently stand.
Contact the Rea Information Services team to schedule an assessment and build an industrial cybersecurity program designed for your operation.
About the Author
Jim Pecchio is a Client Relationship Manager at Rea Information Services, bringing nearly three decades of IT experience to organizations navigating the intersection of technology risk and operational reality. He’s based in the Greater Cleveland area, where he works with manufacturers and growing businesses to build IT programs that reduce risk without slowing operations down.
To connect with Jim or learn more about industrial cybersecurity for your Ohio operation, visit reamanaged.com.
