Network Segmentation for IoMT: Keeping Medical Devices Off the PHI Highway

Devices you cannot patch like a laptop

The internet of medical things is a growing headache. Imaging systems, infusion pumps, and monitoring devices run embedded operating systems that vendors rarely patch on a healthcare schedule. Left on the same flat network as your EHR and file shares, a vulnerable device becomes a quiet backdoor an attacker uses to pivot toward PHI. Network segmentation is the control that contains that risk.

Isolate with VLANs and strict rules

The practical approach is to put devices on their own VLAN with strict firewall rules that allow only the specific traffic each device needs to function, and nothing else. A monitoring device should talk to its collector, not to the domain controller. This contains a compromised device and shrinks the blast radius of an attack dramatically.

Document and watch for drift

Document the segmentation, monitor it for policy drift, and review it whenever a new device comes online. Segmentation will not make a vulnerable device safe, but it stops one device from becoming the path to your entire patient database. Our managed network services include segmentation design and monitoring.

What to do next

List every connected medical device and the traffic it actually needs. Segment accordingly and review the policy after each new device.

• Medical devices often cannot be patched, so isolate them
• Use VLANs and strict firewall rules to limit device traffic
• Monitor for drift and review when devices are added