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    Glossary

    Plain-English definitions for the acronyms and standards you'll see across every topic.

    SBOM, VEX, VDR & CBOM at a glance

    Four artifacts, one inventory family

    SBOM

    Machine-readable list of every software component in the device.

    VEX
    Per-CVE exploitability status: affected, not affected, fixed.
    VDR
    Vulnerability disclosure report — the longer narrative.
    CBOM
    Cryptographic bill of materials: ciphers, key sizes, libraries.

    Think of SBOM as the parent inventory. VEX and VDR explain risk. CBOM zooms in on crypto.

    Standards

    SBOM

    Software Bill of Materials

    A formal, machine-readable inventory of every software component (proprietary, open-source, third-party) that ships in a device. Required by FDA for cyber devices under Section 524B.

    Definition page

    MDS2

    Manufacturer Disclosure Statement for Medical Device Security

    An IHE/HIMSS-standardized form (MDS2) that manufacturers provide to healthcare delivery organizations describing the security characteristics of a device.

    Definition page

    TIR57

    AAMI TIR57

    AAMI Technical Information Report describing security risk management principles for medical devices, the foundation referenced by FDA guidance.

    Definition page

    SW96

    ANSI/AAMI SW96

    Standard for medical device security risk management activities and documentation, complementary to ISO 14971 safety risk management.

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    IEC 81001-5-1

    International standard specifying a secure development lifecycle (SDL/SPDF) for health software and health IT systems.

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    SOUP

    Software of Unknown Provenance

    IEC 62304 term for software not developed for a specific medical device (e.g., OS, libraries, OSS). Must be identified, risk-assessed, and tracked for vulnerabilities throughout the product lifecycle.

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    IEC 62304

    International standard for medical device software lifecycle processes, covering software safety classification (A/B/C), development, maintenance, risk, and configuration management.

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    ISO 14971

    International standard for the application of risk management to medical devices. Security risk management (per AAMI SW96/TIR57) complements but does not replace ISO 14971 safety risk.

    Definition page

    ISO 27001

    International standard for information security management systems (ISMS). Often referenced for the manufacturer's enterprise security posture, distinct from product security.

    Definition page

    UL 2900

    UL standard series for testable cybersecurity criteria of network-connectable products and systems, including UL 2900-2-1 for healthcare and wellness devices.

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    NIST CSF

    NIST Cybersecurity Framework

    A voluntary framework (Identify, Protect, Detect, Respond, Recover, Govern) widely referenced by FDA guidance and used to structure a manufacturer's overall security program.

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    MDR

    EU Medical Device Regulation

    Regulation (EU) 2017/745 governing medical devices in the European Union. Includes cybersecurity expectations clarified by MDCG 2019-16 guidance.

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    Notified Body

    An EU-designated conformity assessment organization that audits manufacturers and reviews technical documentation for CE marking under MDR/IVDR.

    Definition page

    Process

    SPDF

    Secure Product Development Framework

    A lifecycle framework (recognized by FDA) for embedding security into design, development, manufacturing, and postmarket. AAMI TIR57 and IEC 81001-5-1 are common reference standards.

    Definition page

    CVD

    Coordinated Vulnerability Disclosure

    A documented policy and process for receiving, triaging, and disclosing security vulnerabilities responsibly. Required for FDA cyber devices.

    Definition page

    PSIRT

    Product Security Incident Response Team

    The internal team responsible for receiving vulnerability reports, coordinating fixes, and communicating with researchers, customers, and regulators. Required in practice to meet FDA CVD expectations.

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    Pen Test

    Penetration Test

    Goal-oriented security testing that simulates an attacker against a device, its interfaces, and its supporting infrastructure. FDA expects penetration testing evidence for cyber devices.

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    HDO

    Healthcare Delivery Organization

    A hospital, clinic, or health system that deploys and operates medical devices. The primary audience for MDS2 forms and customer-facing security documentation.

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    FDA

    524B

    Section 524B of the FD&C Act

    The FDA cybersecurity authority for cyber devices. Requires a cybersecurity management plan, SBOM, vulnerability monitoring, and reasonable assurance of security in premarket submissions.

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    RTA

    Refuse to Accept

    An early FDA review checkpoint. If a 510(k) submission fails the RTA cybersecurity checklist, it is returned without substantive review, restarting the clock.

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    eSTAR

    electronic Submission Template And Resource

    FDA's interactive PDF template for 510(k) and De Novo submissions. Cybersecurity sections are guided and required.

    Definition page

    TPLC

    Total Product Life Cycle

    FDA's framing for managing risk and quality from concept through end-of-support, including postmarket surveillance and security updates.

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    PMA

    Premarket Approval

    FDA's most stringent device marketing pathway, used for high-risk Class III devices.

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    510(k)

    FDA premarket notification establishing substantial equivalence to a predicate device, the most common pathway for moderate-risk devices.

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    De Novo

    FDA pathway for novel low-to-moderate risk devices that have no predicate.

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    PCCP

    Predetermined Change Control Plan

    An FDA-authorized plan that lets a manufacturer pre-specify certain device modifications (often AI/ML or security updates) and implement them post-clearance without a new submission, provided changes stay within the agreed protocol.

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    QSR

    Quality System Regulation (21 CFR 820)

    FDA's current Good Manufacturing Practice requirements for medical devices, covering design controls, CAPA, document control, and production. Being replaced by QMSR in February 2026.

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    QMSR

    Quality Management System Regulation

    FDA's updated quality system rule that harmonizes 21 CFR 820 with ISO 13485:2016. Takes effect February 2, 2026, replacing the legacy QSR.

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    Predicate

    A legally marketed device used as the basis for a 510(k) substantial-equivalence claim. Cybersecurity comparisons to the predicate are increasingly scrutinized by FDA.

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    FD&C Act

    Federal Food, Drug, and Cosmetic Act

    The foundational U.S. statute giving FDA authority over food, drugs, and medical devices. Section 524B (added by the 2023 omnibus) created explicit cybersecurity authority for cyber devices.

    Definition page

    Technical

    CBOM

    Cryptographic Bill of Materials

    An emerging extension of the SBOM that catalogs cryptographic primitives, libraries, key sizes, and algorithms used by a device.

    Definition page

    STRIDE

    A threat modeling taxonomy (Spoofing, Tampering, Repudiation, Information disclosure, Denial of service, Elevation of privilege) widely used for medical device threat models.

    Definition page

    SCA

    Software Composition Analysis

    Tooling that scans software for known-vulnerable components and license risks, and is the primary mechanism for generating and maintaining an SBOM.

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    CVE

    Common Vulnerabilities and Exposures

    A public catalog of disclosed security vulnerabilities, each assigned a unique CVE ID. Used for tracking known issues against SBOM components.

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    CVSS

    Common Vulnerability Scoring System

    An open framework for scoring vulnerability severity (0.0–10.0) based on exploitability and impact. FDA expects manufacturers to triage findings using CVSS plus device-specific clinical impact.

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    CWE

    Common Weakness Enumeration

    A community catalog of software and hardware weakness types (e.g., CWE-79 XSS, CWE-787 out-of-bounds write). Useful in threat modeling and root-cause analysis.

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    VEX

    Vulnerability Exploitability eXchange

    A machine-readable companion to an SBOM that states whether a known vulnerability actually affects a given product (e.g., 'not affected because component is not invoked'). Reduces noise from SBOM scans.

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    PKI

    Public Key Infrastructure

    The set of roles, policies, and systems for issuing, managing, and revoking digital certificates. Underpins device identity, signed firmware, and secure communications.

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    HSM

    Hardware Security Module

    Tamper-resistant hardware that generates, stores, and uses cryptographic keys. Often used in manufacturing to sign firmware and provision device identities.

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    mTLS

    Mutual TLS

    TLS in which both client and server present and validate certificates. Common pattern for device-to-cloud and device-to-gateway authentication in connected medical devices.

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    OTA

    Over-the-Air update

    Mechanism for remotely delivering signed firmware or software updates to deployed devices. FDA expects a documented, secure update path for the supported lifetime of the device.

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    Secure Boot

    A boot process that cryptographically verifies firmware/software integrity before executing it, anchored in a hardware Root of Trust. Foundational control for tamper resistance.

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    Root of Trust

    An immutable hardware or firmware element (e.g., fused public key, secure element) that anchors all higher-level trust decisions like secure boot and attestation.

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