HL7 Cybersecurity Concerns for Medical Devices

Updated April 15, 2025

Health Level 7 (HL7) is a vital cog in the machinery of healthcare information technology. It is the backbone for data exchange across various healthcare systems, facilitating improved patient care and efficient administration. However, the extensive adoption of HL7 also brings forth significant security challenges. This blog post aims to provide an in-depth analysis of HL7, exploring its purpose, inherent security flaws, and the measures taken to mitigate these risks while also considering its regulatory compliance and future trajectory.

Key Takeaways

• HL7 standards facilitate data exchange in healthcare.
• Older HL7 versions have significant cybersecurity flaws.
• Lack of encryption exposes data to interception.
• Weak authentication can lead to unauthorized access.
• Legacy systems with HL7 are prime cyberattack targets.
• Regulatory compliance like HIPAA matters for HL7.

Table of Contents

• Key Takeaways
• What is HL7?
• The Purpose and Use of HL7
• Cybersecurity Flaws within HL7
• HL7 Abuse Cases
• Addressing HL7 Security Flaws
• HL7 and Regulatory Compliance
• The Future of HL7
• Cybersecurity with HL7 FAQs

Why this matters

The FDA's Cybersecurity in Medical Devices: Quality System Considerations and Content of Premarket Submissions (Feb 3, 2026 final guidance) made cybersecurity documentation a gating criterion for clearance under Section 524B of the FD&C Act. Reviewers now apply this guidance to cybersecurity concerns with hl7 the same way they apply software lifecycle expectations from IEC 62304 and security risk-management expectations from AAMI TIR57 and ANSI/AAMI SW96:2023.

Gaps in this area are the single most common driver of first-cycle cybersecurity Additional Information (AI) requests. The FDA's FY2024 CDRH performance reports show cybersecurity is among the top deficiency categories cited in 510(k) and PMA AI letters, behind only software documentation and clinical evidence. Treating it as a checklist exercise rather than a design-controlled engineering artifact is what creates the gap.

What is HL7?

HL7, or Health Level Seven International, represents a suite of international standards for transferring and managing healthcare information between various systems healthcare providers use. It’s a cornerstone protocol in healthcare IT designed to bridge the gap between disparate systems and ensure smooth communication. Let’s delve deeper into what HL7 entails:

• Origin and Development: HL7 was developed by Health Level Seven International, a not-for-profit, ANSI-accredited standards-developing organization. Founded in 1987, the organization aimed to create a standardized framework for exchanging, managing, and integrating electronic healthcare information.
• Standardization in Healthcare Information: HL7 addresses the need for standardization in the diverse landscape of healthcare IT. It encapsulates a variety of guidelines, methodologies, and frameworks to enable different healthcare systems - such as electronic health records (EHRs), laboratory information systems (LIS), and radiology information systems (RIS) - to communicate effectively.
• HL7 Versions: Over the years, HL7 has evolved, with multiple versions addressing various aspects of healthcare information exchange. The most widely adopted versions are HL7 Version 2.x and HL7 Version 3, each with its unique structure and use cases. HL7 V2.x is known for its ease of implementation and wide adoption, while V3 offers more rigor and complexity, focusing on standardizing the entire data exchange process.
• FHIR (Fast Healthcare Interoperability Resources): The latest advancement in HL7 is FHIR. It utilizes modern web technologies and methodologies to combine the best features of HL7’s Version 2, Version 3, and CDA (Clinical Document Architecture) standards. FHIR is designed to simplify implementation without sacrificing information integrity and is rapidly gaining traction as the go-to standard for electronic health data exchange.
• Scope and Applications: HL7 standards cover a wide range of healthcare data management needs. From administrative tasks, such as patient scheduling and billing, to clinical aspects, like patient care and laboratory results management, HL7 facilitates a broad spectrum of healthcare activities. It’s instrumental in integrating various systems within a healthcare facility and enabling interoperability between different healthcare organizations.
• Global Impact and Adoption: HL7 standards have been adopted worldwide, influencing how healthcare data is exchanged globally. This wide adoption underscores its importance in promoting global health data interoperability and improving healthcare delivery and patient outcomes.
• Community and Collaboration: HL7’s development and evolution are driven by a global community of healthcare IT professionals, including system developers, implementers, and end-users. This collaborative approach ensures that the standards remain relevant, practical, and in line with the evolving needs of the healthcare industry.

The Purpose and Use of HL7

HL7 standards serve as the language of healthcare data exchange. Primarily, they:

• Enable Interoperability: HL7 allows different healthcare systems and applications to communicate and understand each other’s data.
• Facilitate Data Exchange: It streamlines the sharing of clinical and administrative data, including patient records, appointment schedules, billing information, medical reports, and treatment plans.
• Improve Patient Care: HL7 provides timely and accurate patient care by ensuring seamless data transfer.
• Enhance Healthcare Administration: It simplifies administrative processes like insurance claims, payment processing, and regulatory compliance.

HL7 bridges the gaps between diverse healthcare systems, ensuring that crucial health data is accurately and swiftly shared across platforms.

Cybersecurity Flaws within HL7

Despite its benefits, HL7 comes with notable security concerns:

• Data Interception Vulnerabilities: Older versions of HL7 lack strong encryption, making data susceptible to interception during transmission.
• Weak Authentication and Authorization: Inadequate security protocols can lead to unauthorized access to sensitive health information.
• Data Integrity Issues: Without proper safeguards, the integrity of HL7-transmitted data can be compromised, leading to potential misdiagnoses or treatment errors.
• Exposure of Legacy Systems: Many healthcare providers use older systems with outdated HL7 standards, vulnerable to modern cyber threats.

HL7 Abuse Cases

Large-Scale Health Data Breach

In one significant incident, a large healthcare provider experienced a massive data breach where attackers exploited vulnerabilities in the HL7 protocol. This breach led to the unauthorized access of millions of patient records, including sensitive data like medical histories, treatment information, and personal identification details. The attackers bypassed the system’s security due to weak encryption in the HL7 data transmissions. This incident not only resulted in a substantial violation of patient privacy but also raised serious concerns about the robustness of HL7 security measures.

Hospital Network Cyberattack

A sophisticated cyberattack targeted a group of hospitals. The perpetrators leveraged HL7 vulnerabilities to gain access to the network. The attackers exploited unpatched security flaws in the HL7 interface, allowing them to infiltrate the network and disrupt hospital operations. This led to significant delays in patient care services, compromised patient data, and substantial financial losses for the hospitals involved. The incident underscored the importance of regular software updates and the dangers of legacy systems with outdated security protocols.

Ransomware Attack Exploiting HL7 Vulnerabilities

In another instance, a ransomware attack on a healthcare system was traced back to vulnerabilities in the HL7 protocol. Cybercriminals exploited these weaknesses to deploy ransomware across the network, leading to widespread data encryption and system lockdowns. Vital patient care services were halted, causing considerable disruption and endangering patient safety. This attack highlighted the potential for HL7 vulnerabilities to be used as entry points for more extensive network compromises.

Unauthorized Data Access and Manipulation

A smaller-scale but equally concerning incident involved unauthorized access to a healthcare provider’s HL7 system. An attacker manipulated patient data by exploiting insufficient authentication mechanisms within the HL7 protocol. This data manipulation led to incorrect patient records and posed serious patient treatment and diagnosis risks. The breach was a stark reminder of the potential consequences of inadequate authentication and authorization controls in healthcare IT systems.

Interception of Sensitive Health Information

There have been instances where sensitive health information was intercepted during transmission over HL7 protocols. Due to the lack of robust encryption, attackers could eavesdrop on the data exchange, gaining access to confidential patient information. This vulnerability exploitation compromises patient confidentiality and violates healthcare privacy regulations like HIPAA.

Addressing HL7 Security Flaws

To combat these vulnerabilities, a multi-faceted approach is needed:

• Implementing End-to-End Encryption: Ensuring all data in transit is encrypted to prevent unauthorized interception.
• Robust User Authentication: Strengthening access controls to protect against unauthorized data access.
• Regular Security Audits and Updates: Keeping HL7 systems updated with the latest security patches and conducting frequent audits.
• Training and Awareness: Educating healthcare personnel on data security and best practices.

HL7 and Regulatory Compliance

HL7 compliance with healthcare regulations, such as HIPAA in the United States, is crucial. It involves:

• Ensuring Privacy and Confidentiality: Adhering to standards that protect patient data privacy and confidentiality per legal requirements.
• Data Protection Measures: Implementing security measures mandated by healthcare regulations to protect patient data.
• Regular Compliance Audits: Conducting audits to ensure continuous compliance with healthcare laws and guidelines.

The Future of HL7

Looking ahead, HL7 is poised for significant evolution:

• Embracing Advanced Technologies: Integration with newer technologies like blockchain and AI to enhance security and efficiency.
• Enhanced Security Features: Incorporating more robust encryption and authentication mechanisms in future versions.
• Global Standardization: Efforts towards global standardization of HL7 to facilitate international interoperability.

Conclusion

HL7 has undeniably transformed the landscape of healthcare information exchange. However, its utility must be balanced with stringent security measures to protect against the ever-evolving cyber threats. The healthcare industry must continue to evolve and adapt its approach to HL7, ensuring it complies with current regulatory standards and remains prepared for future challenges. As we embrace advanced technologies, the role of HL7 will be pivotal in shaping a more secure, efficient, and interconnected healthcare ecosystem.

Cybersecurity with HL7 FAQs

What is HL7 in healthcare?

HL7 (Health Level Seven) is a set of international standards for the exchange, integration, and retrieval of electronic health information. It's widely used for enabling communication between health IT systems like EHRs, lab systems, and medical devices.

Why is cybersecurity important when using HL7 protocols?

HL7 messages often contain protected health information (PHI), including patient names, diagnoses, and treatment data. Without proper security, these messages can be intercepted, modified, or leaked-leading to HIPAA violations and patient safety risks.

See also: Why Medical Device Cybersecurity Is Nothing Like Enterprise, How Can Medical Device Manufacturers Support Operational, and Navigating the Cybersecurity Landscape for MedTech.

Are HL7 messages encrypted by default?

No. HL7 v2.x, the most widely used version, does not include native encryption. It must be secured using external transport-layer protections like TLS (Transport Layer Security) or a VPN.

What are common cybersecurity risks in HL7 communications?

Risks include:

• Man-in-the-middle attacks

• Data interception or tampering

• Replay attacks

• Unsecured endpoints

• Unauthorized access to message logs

How can HL7 messages be secured during transmission?

Secure HL7 messages by implementing TLS encryption, using mutual authentication, and restricting message transport to trusted IP addresses and ports.

What are best practices for HL7 system authentication and access control?

• Use role-based access control (RBAC)

• Enforce multi-factor authentication (MFA) for HL7-integrated applications

• Log all access attempts and integrate with SIEM systems for monitoring

  • Use role-based access control (RBAC)

  • Enforce multi-factor authentication (MFA) for HL7-integrated applications

  • Log all access attempts and integrate with SIEM systems for monitoring

Is HL7 FHIR more secure than HL7 v2.x?

Yes. HL7 FHIR (Fast Healthcare Interoperability Resources) is designed with web security standards in mind, including HTTPS, OAuth 2.0, and OpenID Connect, offering stronger built-in authentication and encryption support.

How can healthcare providers detect HL7-based cyber threats?

Deploy intrusion detection systems (IDS) and network traffic analysis tools to monitor HL7 message traffic. Look for anomalies, such as unusual message volumes, malformed messages, or connections from unknown sources.

What regulatory requirements apply to securing HL7 data?

Organizations must comply with:

• HIPAA Security Rule (U.S.)

• FDA Premarket Cybersecurity Guidance (for devices using HL7)

• EU GDPR (if applicable) These frameworks require safeguarding PHI and ensuring secure data exchanges.

How does Blue Goat Cyber support HL7 cybersecurity?

Blue Goat Cyber provides:

• Penetration testing of HL7 interfaces

• Risk assessments for EHR and device integrations

• Secure HL7 architecture reviews

• Compliance guidance for HIPAA, FDA, and international standards

We help healthcare organizations secure HL7-driven ecosystems to protect patient data and ensure regulatory compliance.

How Blue Goat approaches this

Blue Goat Cyber's medical device practice is led by engineers with CISSP, OSCP, and prior military red-team backgrounds. We treat cybersecurity documentation as design-controlled engineering output, not a submission template, every artifact (threat model, SBOM, security risk assessment, penetration test, labeling) traces back to a controlled requirement and a verified result.

Our engagements deliver the full Feb 3, 2026 guidance documentation set scoped to the device's risk profile, integrated with the existing IEC 62304 software lifecycle and ISO 14971 risk file. See our medical device cybersecurity services for the full scope. If the FDA raises cybersecurity deficiencies after our submission, we resolve them at no additional cost.

FAQ

What is HL7 in healthcare?

HL7 (Health Level Seven) is a set of international standards for the exchange, integration, and retrieval of electronic health information. It enables communication between health IT systems like EHRs, lab systems, and medical devices.

Why is cybersecurity important when using HL7 protocols?

HL7 messages often contain protected health information (PHI). Without proper security, these messages can be intercepted, modified, or leaked, which leads to HIPAA violations and patient safety risks.

Are HL7 messages encrypted by default?

No, HL7 v2.x, the most widely used version, does not include native encryption. It must be secured using external transport-layer protections such as TLS (Transport Layer Security) or a VPN.

What are common cybersecurity risks in HL7 communications?

Risks include man-in-the-middle attacks, data interception or tampering, replay attacks, unsecured endpoints, and unauthorized access to message logs.

How can HL7 messages be secured during transmission?

Secure HL7 messages by implementing TLS encryption, using mutual authentication, and restricting message transport to trusted IP addresses and ports.

Does the FDA have specific guidance for medical devices using HL7?

The FDA's February 3, 2026 final guidance on premarket cybersecurity for medical devices applies to devices integrating with healthcare IT, including those using HL7. Manufacturers must demonstrate how HL7 use meets cybersecurity requirements.

About the author

Christian Espinosa, CISSP, Founder, Blue Goat Cyber. Christian leads a team focused exclusively on medical device cybersecurity for FDA premarket submissions and postmarket compliance. Read more about Christian.