Cyberattacks don’t have to shut down a network to disrupt critical operations. Sometimes, changing a temperature setting is enough to put essential services at risk. The recent attack involving France’s national blood service shows how a compromised control system can threaten essential services, and why organizations need a clearer understanding of their operational exposure.
What is OT security exposure management?
OT security exposure management helps organizations identify, assess, and reduce cybersecurity risks across connected operational technology (OT) environments. It goes beyond vulnerability scanning by evaluating network connectivity, potential attack paths, segmentation controls, and operational impact. This helps security teams prioritize exposures that could threaten critical operations.
How Did the France Blood Storage Cyberattack Happen?
In November 2026, reports emerged that hackers had manipulated refrigeration controls at three facilities supporting France’s national blood service. Attackers reportedly altered temperature and defrost settings through systems associated with a third-party refrigeration supplier, potentially threatening blood products that depend on carefully controlled storage conditions.
Fortunately, monitoring systems alerted personnel, allowing them to intervene before blood products suffered damage. Collection and distribution continued without interruption.
Similar attacks targeting refrigeration systems across Europe have reportedly caused significant food losses and business disruption.
What makes these incidents particularly concerning is how a seemingly narrow point of access can threaten an essential operation. Refrigeration controls may not immediately come to mind when security leaders assess their cyber risk. Yet hospitals, food distributors, manufacturers, and logistics providers increasingly depend on connected equipment to maintain safe, reliable operations.
A compromised system doesn’t need to contain sensitive data to create serious consequences.
Why OT Security Matters Beyond Industrial Networks
Operational technology, or OT, traditionally brings to mind factories, power plants, and industrial control systems. Today, connected operational equipment supports a much broader range of services.
Hospitals rely on temperature-controlled storage, laboratory systems, and building automation. Retailers and logistics providers depend on refrigeration, warehouse equipment, and distribution infrastructure. Utilities and manufacturers connect operational systems to enterprise networks for monitoring, maintenance, and efficiency.
Connections improve operations, but they can also give attackers another way in.
Remote access, third-party maintenance, cloud management platforms, and interconnected IT systems have made operational environments easier to manage. They’ve also complicated the task of understanding who and what can reach critical equipment.
Security teams may have detailed inventories of their IT assets and vulnerability data, yet still lack a clear picture of connectivity, infrastructure access, and mitigating controls across operational environments.
An asset inventory alone cannot show which systems an attacker could reach. Understanding OT security exposure requires visibility into network connectivity, potential attack paths, and the security controls that restrict access to critical operational systems.
Why Vulnerability Scanning Alone Isn’t Enough for OT Security
Vulnerability scans identify weaknesses. They don’t always show what an attacker could reach through the network or via other systems. That work remains essential, but it doesn’t answer every question about operational risk.
Consider a remote access system used to support industrial equipment. A vulnerability in that system deserves attention. But the potential consequences depend on several additional factors.
- Can someone reach that system from an untrusted network?
- What other assets could become accessible if an attacker compromises it?
- Do security controls restrict access to critical operational equipment?
- Could a single compromised system expose multiple facilities?
Those questions require an understanding of asset and infrastructure relationships, not just a list of vulnerabilities.
Attack path analysis helps security teams examine how weaknesses, controls, and permitted connections could combine to expose important assets. Segmentation validation helps determine whether existing network controls restrict access as intended.
Both become especially valuable in OT environments, where security teams often face limited maintenance windows, specialized equipment, uptime requirements, and operational constraints that make remediation more complicated.
A high vulnerability score doesn’t automatically mean a system presents the greatest operational risk. Direct and indirect reachability, available attack paths, and potential business impact all matter.
How to Identify and Reduce OT Security Exposure
Reducing OT risk starts with understanding the environment and identifying where connectivity creates unacceptable exposure. For organizations managing complex IT and OT networks, that means answering several practical questions.
What do we have, and how is it connected?
Accurate hybrid environment visibility helps teams identify infrastructure, connected environments, and the relationships between systems. Without that foundation, security decisions often rely on incomplete information.
Which paths could expose critical operations?
Understanding potential attack paths helps teams identify where an attacker might move through reachable systems. Network segmentation can limit that movement, but only when policies and configurations work as intended.
Which exposures should we address first?
Operational consequences should influence prioritization. An exposure that could provide access to a critical production system may deserve more urgent attention than a higher-scoring vulnerability with limited reachability.
How do we know our fixes worked?
Security teams need a way to evaluate whether network changes actually reduce exposure without introducing unnecessary operational disruption.
RedSeal helps organizations strengthen OT security exposure management by using a digital twin to model network connectivity. Security teams can analyze potential multi-hop attack paths, evaluate network reachability, and validate segmentation controls without conducting intrusive testing against live operational systems.
That distinction matters in environments where availability and safety come first.
RedSeal doesn’t replace OT monitoring, endpoint protection, or the safety controls built into operational equipment. Rather, it provides network exposure context that helps organizations understand how their connected environments may create opportunities for attackers.
How Network Segmentation Helps Contain OT Cyberattacks
France’s blood-storage incident also demonstrates the importance of operational safeguards.
Monitoring systems identified abnormal conditions, and personnel responded before the incident caused reported product losses. Those controls provided an essential layer of protection.
Cybersecurity teams need to think about prevention and resilience together. Preventing every intrusion isn’t realistic. Limiting what an attacker can reach, however, can reduce the potential consequences of a compromise.
For organizations that depend on OT, this requires close coordination between security, network engineering, operations, and third-party providers. Each group brings a different understanding of the systems involved, their dependencies, and the consequences of disruption.
Proactive exposure management supports that collaboration by giving security and operation teams a shared view of connectivity and potential attack paths.
Still, no single security tool can account for every risk. Supplier-managed systems, cloud control interfaces, credentials, and equipment-specific safety mechanisms all require appropriate oversight.
Protecting Critical Operations Through OT Exposure Management
Connected operational systems have become essential to healthcare, manufacturing, utilities, logistics, and other critical services. More connected equipment means more potential paths to critical systems.
France’s refrigeration incident offers a useful reminder. A seemingly limited point of access can create consequences far beyond the digital environment.
Security teams can’t eliminate every weakness. They can identify unnecessary network access, validate segmentation, and prioritize the exposures that present the greatest potential operational impact.
For organizations evaluating their OT security posture, a practical next step is to examine network reachability to critical operational assets and determine whether existing controls provide the intended isolation.
See how RedSeal helps identify attack paths, validate segmentation, and reduce exposure across complex IT and OT environments. Request a demo.
