Hospital cybersecurity programmes often focus on electronic health records (EHRs), patient portals and enterprise platforms because these systems contain sensitive data. Yet connected devices and operational systems can also expose healthcare organisations to risk. Heating, ventilation and air conditioning controls, oxygen supply systems, imaging equipment and other network-connected devices may share networks with clinical applications. Some run specialised operating systems that make security agents difficult to install and patching difficult to perform. These conditions can extend cyber risk beyond data exposure into service disruption and care delivery.
Overlooked Infrastructure Risks
Security investment commonly prioritises EHR systems, billing platforms and clinical applications because attackers can clearly target them. More sophisticated attackers may look for weaker entry points within a network rather than beginning with the most protected systems. In hospitals, those entry points can include building systems, environmental controls, diagnostic equipment and operational technology.
Heating, ventilation and air conditioning controls, air filtration and temperature management systems can be network-connected while lacking modern security protections. These systems may also receive limited vulnerability testing. If attackers compromise them, sterile environments or critical care spaces can face disruption. The same systems can also provide a route into other parts of an enterprise network.
Medical imaging and diagnostic equipment create another risk category. X-ray machines, CT scanners and cardiac care systems often use embedded software that cannot support standard security tools or regular patching. Artificial intelligence can help attackers probe these systems and create targeted exploits that provide network access.
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Critical infrastructure and operational technology (OT) controllers also require attention. Systems controlling oxygen supply, power management and utilities can operate on proprietary firmware and may lack modern authentication or threat monitoring. These characteristics can make them accessible targets for persistent threat actors.
Lateral Movement Across Mixed Networks
A cyberattack can become more damaging after the first vulnerable device or service has been exploited. Initial access creates a foothold, but the broader risk comes from movement across connected systems. Attackers can use access to move laterally through a network while looking for more valuable targets, including critical datasets or infrastructure.
Hospital networks can be exposed to east-west network movement because they often combine a wide range of connected systems, including newer and legacy equipment. This environment can allow attackers to move from device to device without immediate detection. The risk does not remain limited to the first compromised system.
A minor vulnerability in one OT system or medical device can therefore escalate into a larger incident. The consequences can affect wider hospital operations, not only data security. This is especially relevant when infrastructure that supports care delivery shares network connections with enterprise and clinical applications.
The challenge comes from the combination of essential operational systems, embedded devices and uneven security capabilities. Some systems support direct hospital operations but were not designed with leading-edge cybersecurity controls. Others cannot easily accept conventional security agents. Together, these conditions create an environment where one exposed system can become a pathway to broader disruption.
Containment Through Zero Trust Controls
Full network redesign may not be realistic for many healthcare organisations. Replacing, restructuring or updating large parts of a hospital network can be costly, operationally risky and time-consuming. Containment therefore becomes an important priority. The focus shifts to limiting the spread of malicious activity after attackers gain initial access.
Zero Trust security architecture uses system and user verification for every connection. This approach changes the traditional model in which traffic inside a network receives assumed trust. Instead, connection requests must satisfy access controls before activity can flow through the network.
Implementation can begin around one critical system at a time. Protective controls can then expand gradually as the Zero Trust principle broadens across the environment. Network-level controls can match real business operations carried out by authenticated users, for predefined reasons and through approved devices.
Segmentation also plays an important role. By isolating sensitive infrastructure and devices, healthcare organisations can create security boundaries that control how devices communicate with the rest of the network. Each connection request must be legitimate. If one device becomes compromised, attackers face greater difficulty spreading to other systems.
Zero Trust platforms can add access controls around critical systems and applications without extensive changes to network infrastructure. By verifying users, devices and applications before allowing connections, they can limit unauthorised activity and reduce uncontrolled movement through the network.
Connected hospital infrastructure can create cybersecurity risks that go beyond EHR systems, portals and enterprise platforms. Building controls, imaging equipment and OT controllers may support essential operations while lacking modern protections, authentication or monitoring. Once attackers gain access, lateral movement can allow a small weakness to grow into a broader operational incident. Zero Trust architecture offers one containment-focused approach by verifying connections, limiting communication between systems and reducing reliance on perimeter defences alone.
Source: Healthcare IT Today
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