TL;DR: Legacy medical devices remain a governance problem because they often outlive support periods, depend on older codebases, and can expose patient safety to security failures, according to Kusari. The practical lesson is that inventory, segmentation, vulnerability sharing, and continuity planning matter more than waiting for perfect patching.
At a glance
What this is: Legacy medical devices create outsized security risk because compromise can affect patient care, while their age, cost, and support gaps make conventional patch-first approaches unreliable.
Why it matters: For IAM and security teams, the lesson is that governance around inventory, exposure reduction, and continuity has to compensate for devices that cannot be treated like normal IT assets.
Context
Legacy medical devices are a governance problem as much as a technical one. They often remain in service for years or decades after support ends, and in healthcare the consequence of failure is not just downtime but potential patient harm. That changes the control model: teams cannot rely on rapid patching alone, so they need inventory, exposure reduction, and recovery planning to compensate for the lifecycle gap.
The identity and access angle is real even when the asset is not a user account. Medical devices still need to be discovered, classified, placed into network zones, and controlled so they only reach the resources they truly require. In that sense, device inventory and segmentation function as governance controls for a high-consequence environment, not just network hygiene.
Key questions
Q: What should organisations do first when legacy medical devices are not fully supported?
A: Start with a full inventory of every device, including where it is deployed, what it depends on, and whether it is still supported. If you do not know what is in the environment, you cannot segment it, prioritise it, or decide whether compensating controls are needed. Inventory is the foundation for every other control.
Q: Why do legacy medical devices create a different risk model from ordinary IT assets?
A: Legacy medical devices can affect patient safety directly, remain in use long after vendor support ends, and may be difficult or impossible to patch. That means risk decisions must account for continuity of care, not just confidentiality and availability in the usual IT sense.
Q: What breaks when legacy medical devices are connected without isolation?
A: A compromise can spread beyond the device itself and create a broader operational incident. Without segmentation, an exploited device can become an entry path into adjacent systems, or force clinicians into paper-based workarounds that slow treatment. Isolation reduces blast radius when patching is slow or impossible.
Q: Who should be accountable for securing connected medical devices across their lifecycle?
A: Accountability should be shared, but not blurred. Healthcare security teams, clinical operators, and medical device manufacturers all have defined roles. Providers must enforce onboarding, monitoring, and credential discipline. Manufacturers must build secure-by-design devices with unique identities and signed firmware. When ownership is unclear, gaps appear at the handoff points where breaches most often start.
Technical breakdown
Why legacy medical devices are different from normal IT assets
Legacy medical devices are unusual because their security failures can change clinical outcomes, not just disrupt operations. They may run software built on old C or C++ codebases, remain deployed beyond vendor support, and in some cases be physically difficult or impossible to replace. That combination means patching is often slow, risky, or incomplete, and the organisation has to assume a longer exposure window than it would tolerate for ordinary endpoints. In healthcare, that exposure is measured against patient safety, not only data loss or uptime.
Practical implication: treat unsupported medical devices as high-consequence assets that require compensating controls rather than normal patch cycles.
How inventory and isolation reduce the attack surface
Inventory is the starting point because you cannot protect what you have not located, classified, and mapped to its dependencies. Once devices are known, segmentation can keep a compromise from spreading and can prevent a device from reaching systems or services it does not need. This is especially important where the device is not the primary target but becomes an incidental entry path into a broader hospital network. Restricting removable media and unnecessary connections further narrows exposure, particularly for devices that were never designed for modern trust boundaries.
Practical implication: build a device inventory that feeds segmentation, media control, and access scoping decisions.
Why shared vulnerability handling matters in healthcare environments
Medical device risk does not end at the manufacturer boundary. Hospitals, device makers, and peer organisations need rapid vulnerability sharing because delays can leave fielded devices exposed long after a flaw is known. The operational challenge is not only disclosure but coordinated mitigation, because the same vulnerability may need workarounds, temporary containment, or exception-based patching depending on the device type and clinical use. Business continuity planning matters here because the right response must preserve care delivery while a flawed device is contained or restored.
Practical implication: establish a vulnerability communication path and a continuity plan before the next device issue emerges.
Threat narrative
Attacker objective: The attacker’s objective is to compromise a legacy device in a way that either disrupts clinical operations or creates unsafe patient outcomes.
- Entry occurs through an exposed or vulnerable legacy medical device that remains in service after vendor support has ended.
- Escalation is driven by poor isolation, allowing the device to be used as a foothold or to affect adjacent systems in the hospital environment.
- Impact can include disrupted care, forced fallback to paper processes, delayed treatment, or direct patient harm if device behaviour is altered.
Breaches seen in the wild
- Sisense breach 2024: A credential in Sisense's GitLab reportedly opened S3 buckets of customer tokens, passwords and certificates; CISA urged a full reset.
- CISA Private-CISA GitHub leak 2026: A CISA contractor's public GitHub repo exposed AWS GovCloud admin keys, Artifactory credentials and plaintext passwords for six months.
Read and download The State of NHI & AI Agent Breach Report 2026, covering 200+ breaches impacting Non-Human Identities including AI Agents.
NHI Mgmt Group analysis
Inventory is the control that makes legacy device governance possible. If organisations cannot identify every medical device, they cannot segment it, assess support status, or decide whether a compensating control is needed. The article correctly treats discovery as the first governance layer, because unmanaged devices create blind spots that undermine every other control. For security and clinical teams, the practical conclusion is that inventory quality is now a patient-safety issue, not just an asset-management issue.
Isolation is the most realistic control when patching is uncertain. Legacy medical devices may not support fast or reliable remediation, especially when codebases are old, source code is missing, or clinical disruption is unacceptable. That means network segmentation, removable media restrictions, and access scoping become primary risk reducers. For practitioners, this shifts the question from 'how quickly can we patch' to 'how tightly can we contain' while preserving care.
Patient-safety exposure gap: this article shows the governance assumption that failed is that all important systems can be patched like normal IT. Legacy medical devices invalidate that assumption because the consequences of delay are clinical, not just technical. In risk terms, the control gap is a lifecycle mismatch between device longevity and security maintenance capability. Practitioners should treat that mismatch as a standing exception process, not a temporary inconvenience.
Information sharing is a governance control, not a communications courtesy. The article makes clear that device manufacturers and health delivery organisations need fast channels for vulnerabilities and mitigation steps. Without that coordination, the same issue can remain unresolved across many sites even after it is known. For the field, this is a reminder that coordinated disclosure and operational workarounds are part of medical device resilience, not optional extras.
Continuity planning must assume device compromise will happen. Health systems cannot afford to discover their response plan during an outage when patient care is already under pressure. The article’s emphasis on restoring service, containing damage, and preserving care reflects a resilience-first posture. For practitioners, the conclusion is straightforward: continuity design should be built around the loss of a critical device system, not around ideal patch timelines.
What this signals
Legacy medical device security is really a lifecycle governance problem. The practical issue is not whether a device can be made perfectly safe, but whether the organisation can keep it inside a controlled operating envelope after support ends. That requires joining asset discovery, isolation, and recovery planning into one programme rather than treating them as separate workstreams.
The security programme should assume that some medical devices will remain in service longer than their manufacturers intended. When that happens, compensating controls become the real control surface, especially segmentation, removable media restrictions, and rapid mitigation sharing between suppliers and operators.
For practitioners
- Build a complete medical device inventory Record every device’s location, function, support status, dependencies, and end-of-life date so security decisions are based on an accurate asset picture.
- Segment legacy devices into constrained network zones Use the inventory to place devices behind tighter network boundaries so compromise cannot easily spread to clinical or administrative systems.
- Restrict removable media and external connectivity Apply policies that block unnecessary USB use and other inbound or outbound paths that legacy devices do not require for normal operation.
- Establish a rapid vulnerability sharing process Set up a communication path with manufacturers and peer health organisations so mitigation guidance reaches operators before a device is broadly exposed.
- Test continuity plans for device compromise Exercise containment, manual fallback, and service restoration steps for scenarios where one or more medical devices must be taken offline.
Key takeaways
- Legacy medical devices should be treated as high-consequence assets because a compromise can affect care delivery as well as system availability.
- The article’s core operational message is that discovery and isolation matter more than hoping for fast or perfect patching.
- Healthcare teams need continuity plans and supplier communication paths before a device issue becomes an outage.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST CSF 2.0, CIS Controls v8 and NIST SP 800-53 Rev 5 set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | ID.AM-01 — Physical devices and systems inventoried | The article centres on locating and tracking medical devices before applying controls. |
| PR.AA-05 — Access Permissions, Entitlements and Authorizations | Segmentation and media restrictions are access-scope controls for legacy devices. | |
| Recommendation — Inventory all medical devices with support status and dependencies before assigning risk treatment. Constrain device communications to the minimum required access paths and services. | ||
| CIS Controls v8 | CIS-12 — Network Infrastructure Management | Network isolation is the main exposure-reduction strategy described in the article. |
| Recommendation — Segment legacy medical devices into tightly controlled network zones and restrict unnecessary connectivity. | ||
| NIST SP 800-53 Rev 5 | RA-3 — Risk Assessment | Legacy devices require explicit risk decisions when patching is uncertain or impossible. |
| Recommendation — Assess each unsupported device for compensating controls and documented exceptions. | ||
| ISO/IEC 27001:2022 | A.8.2 — Privileged Access Rights | Device access must be tightly scoped because legacy equipment cannot absorb broad trust. |
| Recommendation — Limit administrative and operational access to medical devices to only approved, necessary users. | ||
Key terms
- Legacy Medical Device: A legacy medical device is a clinical system that remains in use after its original support window, often with limited patching options and older software dependencies. These devices can be technically functional while still carrying elevated security and safety risk because lifecycle management has drifted behind operational use.
- Compensating Control: A compensating control is a measure that reduces risk when the ideal fix, such as immediate patching or redesign, is not possible. In OT, compensating controls often include session recording, access restriction, and tighter monitoring. They do not eliminate the underlying issue, but they narrow exposure until safer remediation can happen.
- Network Segmentation: Network segmentation divides traffic and resources into controlled zones so access can be restricted between groups, systems, or applications. In remote access design, segmentation limits what a connected user or workload can reach after authentication, which reduces lateral movement and shrinks blast radius.
- Business Continuity: Business continuity is the capability to keep essential services operating through disruption and recover them afterward. In identity programmes, continuity depends on access control, authentication, and recovery governance remaining dependable when normal workflows are stressed or unavailable.
Deepen your knowledge
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Published by the NHIMG editorial team on August 19, 2026.
Updated on October 12, 2026.
NHI Mgmt Group, the independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org