Most healthcare organizations have a common security framework on paper. What they often lack is a structured, repeatable process for applying that framework specifically to medical imaging infrastructure, where DICOM streams, PACS servers, and imaging workstations sit on network segments that general-purpose security tools frequently miss.
For CISOs and security teams, imaging systems present a distinct risk profile. Medical devices are rarely on standard patching cycles, DICOM traffic is often unencrypted on legacy networks, and third-party vendor remote access to PACS environments is a persistent blind spot. The result is that organizations can be broadly HIPAA-compliant on their EHR side while carrying critical gaps in the imaging stack.
This framework addresses that gap. The seven steps below provide security teams with a structured methodology for assessing imaging-specific risks, mapping findings to recognized control frameworks, and building a defensible remediation program.
Step 1: Build a Complete Asset Inventory for Imaging Systems
Risk assessment can only cover what you can see. In most health systems, the imaging asset inventory is incomplete.
Start by enumerating every component in the imaging environment:
- PACS servers (on-premise and cloud-hosted)
- Imaging modalities: CT, MRI, X-ray, ultrasound, fluoroscopy
- DICOM routing nodes and worklist servers
- Radiology workstations and diagnostic displays
- VNA (vendor-neutral archive) systems
- RIS integrations and HL7 interfaces
- Third-party teleradiology connections
- Remote access gateways used by vendors and teleradiologists
For each asset, record the operating system and version, network segment, patch status, vendor support status (whether the OS is still receiving security updates), and any known remote access credentials.
Medical imaging environments frequently contain end-of-life operating systems. Windows 7 and Windows Server 2008 instances running on PACS workstations are not hypothetical; they are common findings. These systems cannot be patched against known CVEs, making them priority items during the vulnerability phase.
The asset inventory is not a one-time exercise. Maintain it as a living document, updated whenever a new modality is deployed or a vendor is granted remote access.
Step 2: Model Threats Specific to Imaging Infrastructure
Generic threat models imported from enterprise security programs miss imaging-specific attack vectors. Build a threat model that reflects the actual imaging environment.
The primary threat categories for imaging systems include:
- Ransomware targeting PACS servers, which can halt diagnostic operations across an entire facility
- DICOM exploitation, where unvalidated DICOM files can be used to push malicious payloads to modalities and workstations
- Unauthorized access to imaging archives, enabling exfiltration of identifiable patient data at scale
- Vendor remote access abuse, where compromised service accounts provide persistent footholds
- Lateral movement from imaging networks to clinical systems, particularly where PACS integrates directly with EHR platforms
Map each threat to the assets identified in Step 1. Assign likelihood scores based on your organization’s specific context: a facility with high teleradiology volume faces different vendor access risks than one that manages imaging entirely in-house.
For organizations using cloud PACS, add threats related to misconfigured storage buckets, insecure API endpoints, and identity and access management failures in cloud tenants. Understanding how to secure patient data in the cloud requires addressing cloud-specific vectors as well as on-premises concerns.
Step 3: Run Vulnerability Scans Across the Imaging Network
Vulnerability scanning of imaging environments requires a different approach than standard enterprise scanning. Aggressive scanning against medical devices can cause modality crashes or corrupt imaging queues. Use credentialed scans where possible, and coordinate scan windows with imaging operations teams.
Key areas to scan and assess:
- PACS server CVEs, particularly remote code execution vulnerabilities in DICOM listeners
- Unencrypted DICOM transmission on internal network segments
- Default or shared credentials on imaging workstations and modalities
- Exposed web interfaces on imaging systems (PACS web viewers, worklist portals)
- VPN and remote access configurations used by service vendors
- Missing patches on workstations, servers, and any Windows-based imaging components
Supplement automated scanning with manual review of DICOM network configurations. Many organizations discover that DICOM traffic between modalities and PACS is transmitted without TLS, exposing patient imaging data to interception on the internal network. Addressing medical image data encryption at the transport layer is one of the first remediations to emerge from this step.
Document every finding with asset reference, CVE identifier, where applicable, and current exposure level. These raw findings list feeds directly into the impact analysis in Step 4.
Step 4: Conduct Impact Analysis
Impact analysis translates vulnerability findings into business risk. Not every vulnerability carries the same consequence for a healthcare organization, and prioritization requires understanding what each finding could actually enable.
Assess each finding across three dimensions:
- Confidentiality impact: could exploitation lead to unauthorized access to patient imaging data or associated PHI?
- Integrity impact: could exploitation allow modification or destruction of imaging data, affecting diagnostic accuracy?
- Availability impact: could exploitation take imaging systems offline, delaying patient care?
Use a risk matrix to produce a composite risk score (likelihood x impact) for each finding. HIPAA’s Security Rule requires that covered entities assess “the potential risks and vulnerabilities to the confidentiality, integrity, and availability of ePHI” as part of the Security Management Process (45 CFR §164.308). The risk scoring you perform here directly satisfies that requirement and should be documented in sufficient detail to withstand an OCR audit.
The HHS Office for Civil Rights has published a Security Risk Assessment Tool that guides organizations through this process and produces documentation suitable for compliance reporting. For smaller facilities or those conducting their first formal assessment, this tool provides a structured starting point aligned with HIPAA’s risk analysis requirements.
Step 5: Map Findings to a Common Security Framework
Once findings are scored, map them to the control frameworks your organization uses for compliance. For healthcare imaging environments, three frameworks are most relevant.
NIST Cybersecurity Framework 2.0
NIST CSF 2.0 organizes controls across six functions: Govern, Identify, Protect, Detect, Respond, and Recover. Each vulnerability finding from Step 3 maps to one or more of these functions. A missing asset inventory maps to Identify. Unencrypted DICOM transmission maps to Protect. Absent logging on PACS servers maps to Detect.
The HIPAA security implementation guidance published by NIST in February 2024 (SP 800-66 Rev. 2) provides explicit crosswalks between HIPAA Security Rule requirements and NIST CSF subcategories. For CISOs who need to demonstrate alignment between HIPAA compliance obligations and their existing security program, this document is the most practical reference available.
HITRUST CSF
HITRUST’s Common Security Framework provides prescriptive control requirements specifically designed for healthcare. HITRUST certification carries weight with health system clients and partners, and many cloud PACS vendors now pursue HITRUST r2 certification as a vendor assurance baseline. Map your imaging-specific findings to the relevant HITRUST control categories, particularly those related to access control, audit logging, and incident management.
ISO 27001
For organizations operating internationally or those that prefer a process-oriented framework, the ISO 27001 Annex A controls cover the core domains relevant to imaging infrastructure: information classification, access management, cryptography, supplier relationships, and information security incident management.
Pick the framework (or combination) that aligns with your existing compliance program. Avoid maintaining separate tracking systems for each framework, where you can instead use the crosswalk mappings to capture one finding mapped to controls across multiple frameworks simultaneously.
Step 6: Prioritize Remediation
The output of Steps 4 and 5 is a list of findings with risk scores and control mappings. Step 6 turns that list into a prioritized remediation plan.
Apply the following sequencing logic:
- Critical risk findings with availability impact first. Vulnerabilities that can take PACS offline rank highest because they directly threaten the continuity of patient care.
- High-risk findings affecting the confidentiality of ePHI at scale. Unprotected DICOM archives or unsegmented imaging networks that enable mass data exfiltration fall into this category.
- Medium-risk findings that are low-effort to remediate. Hardening default credentials or enabling audit logging on imaging workstations takes hours and eliminates a category of exposure.
- Long-cycle items requiring vendor coordination. End-of-life OS remediation on legacy modalities often requires vendor support and capital planning cycles of 12 to 24 months. Document these as accepted risks with compensating controls.
For organizations evaluating whether PACS HIPAA compliance requirements are met across their imaging stack, the remediation prioritization output also serves as the risk management plan required under HIPAA’s Security Management Process standard. The plan should document what was found, what will be remediated, what is accepted with compensating controls, and on what timeline.
OmniPACS supports remediation planning for cloud-hosted imaging environments by providing built-in encryption, access controls, and audit logging aligned with HIPAA technical safeguards. For facilities looking to reduce imaging infrastructure risk without extended capital cycles, flexible pricing for every need makes it practical to adopt a security-by-design PACS platform without large upfront commitments.
Step 7: Establish Continuous Monitoring
A risk assessment conducted once is a compliance document. A continuously conducted risk assessment program is a security posture. Step 7 operationalizes monitoring to catch new vulnerabilities, configuration drift, and emerging threats before they become incidents.
Build monitoring into the imaging environment across four layers:
- Patch and vulnerability tracking: Assign ownership for reviewing CVEs affecting PACS vendors, imaging modalities, and supporting infrastructure. Track vendor security bulletins and set internal SLAs for critical patch deployment.
- Access and authentication monitoring: Log all access to PACS servers, imaging archives, and administrative interfaces. Monitor for anomalous access patterns, particularly outside normal operating hours or from unexpected source IPs, including vendor remote access sessions.
- Network traffic analysis: Baseline normal DICOM traffic patterns for your environment. Alerts on unusual volume, new DICOM sources, or traffic to unexpected destinations can surface both misconfigurations and compromise attempts early.
- Audit and compliance review cadence: Schedule quarterly internal reviews of imaging security controls and an annual formal risk assessment update. HIPAA requires regular review; a documented cadence demonstrates ongoing compliance effort, which OCR considers favorably in enforcement actions.
Putting the Framework into Practice
A 7-step assessment is a significant undertaking, and most security teams run it in phases rather than all at once. Start with the asset inventory and vulnerability scan, which together generate the most immediate, actionable findings. The control mapping and remediation prioritization phases can follow once you understand the full scope of the imaging environment.
OmniPACS customers benefit from an architecture that has already addressed many of the infrastructure controls this framework identifies: encryption in transit and at rest, role-based access control, comprehensive audit logging, and SOC 2 Type II and HIPAA-aligned security practices built into the platform. That reduces the surface area the CISO team needs to assess and remediate internally, and compresses the time from assessment to compliance.
Security teams using this framework in environments that include OmniPACS can focus their assessment effort on the integration points, network segmentation, and identity management layers rather than re-evaluating foundational infrastructure controls.
For facilities building their imaging security program from the ground up, this framework provides the sequence. Run the steps in order, document findings and decisions at each stage, and revisit the full assessment annually. The goal is not a perfect score on day one, but a defensible, improving posture over time that satisfies regulators, protects patients, and gives the CISO team clear visibility into where imaging risk lives. Teams that want to explore OmniPACS solutions as part of that posture will find a platform built from the ground up to support these controls rather than retrofit them.
Frequently Asked Questions
How often should a healthcare organization conduct a HIPAA risk assessment for imaging systems?
HIPAA requires covered entities to conduct a risk analysis as part of the Security Management Process, but does not specify a fixed interval. Most organizations perform a formal assessment annually and conduct lighter reviews when significant changes occur, such as deploying a new imaging modality, migrating to cloud PACS, or changing a major vendor.
What is the difference between a HIPAA risk assessment and a NIST CSF assessment for imaging?
A HIPAA risk assessment is a compliance requirement focused on identifying threats to ePHI confidentiality, integrity, and availability. A NIST CSF assessment is a broader evaluation of cybersecurity posture across the six CSF functions. The two overlap significantly, and NIST SP 800-66 Rev. 2 provides explicit mappings between them. Most CISOs use NIST CSF as the operational framework and map findings back to HIPAA requirements for compliance documentation.
Can HITRUST certification replace a HIPAA risk assessment?
No. HITRUST certification demonstrates that an organization meets the HITRUST CSF control requirements, which are mapped to HIPAA. However, OCR requires covered entities to document their own risk analysis, identifying threats specific to their environment. HITRUST certification supports that documentation but does not substitute for it.
What compensating controls apply when a legacy imaging modality cannot be patched?
Common compensating controls for end-of-life imaging devices include: network segmentation to isolate the device from general clinical and administrative networks; application-layer firewalls to restrict DICOM traffic to known sources; enhanced monitoring for anomalous traffic from the device; and physical access controls. These controls should be documented in the risk management plan with the associated accepted risk and remediation timeline.
Does NIST CSF 2.0 apply to healthcare organizations?
Yes. NIST CSF 2.0 is a voluntary framework applicable to any organization. For healthcare, HHS has explicitly endorsed NIST CSF as a recognized security practice under the 2021 HITECH amendment. Demonstrating CSF implementation can result in more favorable OCR treatment during enforcement activities.