11 min read

Medical Device SBOM Costs: Who Pays for Vendor Code Debt?

The Cost-Shifting Calculus of IoMT Security

• The SBOM Reality: A medical device Software Bill of Materials is a structured, machine-readable inventory of the third-party, open-source, and proprietary software components embedded within connected clinical hardware.
• The Regulatory Teeth: Under Section 524B of the Food, Drug, and Cosmetic Act, the FDA requires device manufacturers to submit an SBOM to secure premarket clearance, legally shifting cybersecurity from an operational afterthought to a licensing gate.
• The Operational Tax: While device manufacturers capture the economic margins of using free, unpatched open-source libraries to accelerate their time-to-market, hospitals absorb the crushing labor costs of parsing, validating, and manually remediating these messy files.
• The Integration Chasm: Standard formats like SPDX and CycloneDX frequently arrive with non-normalized naming conventions, forcing clinical security teams to manually reconcile vendor data against the National Vulnerability Database.

The Telemetry Gateway Autopsy: When a Free Library Costs a Hospital $18,450

When a routine vulnerability scan flagged a critical remote code execution vulnerability in a pediatric telemetry gateway, our clinical security team assumed the manufacturer's newly issued medical device SBOM would point us directly to the fix. The device, which monitors real-time cardiac data for 18 pediatric beds, was running an embedded Linux distribution. Our scanner identified a high-severity buffer overflow in an XML parsing library, a vulnerability that theoretically allowed an attacker on the clinical VLAN to crash the gateway or execute arbitrary code.

We pulled the manufacturer's FDA-mandated SBOM, hoping to quickly verify the package version and patch status. What we found instead was a flat, un-normalized SPDX JSON file that listed the top-level operating system but completely omitted the nested, transitive dependencies. The XML parser library was buried three layers deep, hidden inside a commercial database connector that the manufacturer had licensed and integrated without further inspection. The vendor's file listed the component under a proprietary internal name, "xml-parse-lib-v2," rather than its standard Common Platform Enumeration (CPE) identifier.

Because the naming conventions did not align, our automated vulnerability management tools could not map the component to the National Vulnerability Database (NVD). The investigation stalled. To resolve the discrepancy, we had to pull the gateway from the clinical floor, set up a isolated hardware-in-the-loop test environment, and assign a senior firmware security engineer to perform a binary analysis of the firmware image. We discovered the gateway was running an unpatched version of an open-source parser that had been publically disclosed as vulnerable three years prior.

The true cost of this single un-normalized SBOM was not free. It consumed 38 hours of senior engineering labor, forced us to divert pediatric patients to other monitored beds for three days, and cost our hospital system $18,450 in unbudgeted operational overhead. Meanwhile, the medical device manufacturer, having already sold the hardware and captured their upfront hardware margins, spent nothing. They had met their regulatory obligation simply by delivering a file—regardless of how inaccurate, messy, or operationally useless that file turned out to be.

Inside the Normalization Engine: Why Machine-Readable Does Not Mean Machine-Usable

To understand why SBOMs fail in production, one must look at the technical mechanics of software composition analysis. An SBOM is typically generated at build time using static analysis tools that scan source code repositories, or binary analysis tools that inspect compiled firmware. These tools generate structured data in formats like SPDX (Software Package Data Exchange), championed by the Linux Foundation, or CycloneDX, managed by OWASP. These formats are designed to be machine-readable, utilizing JSON or XML schemas to describe package names, versions, licenses, and cryptographic hashes.

An SBOM is like a nutrition label on a packaged food item, but instead of using standardized terms like "sodium," every food manufacturer is allowed to invent their own language—one writing "salt," another "NaCl," and a third "savory crystals"—leaving the consumer to hire a chemist just to read the box. Without strict data normalization, machine-readable files remain operationally inert. If one vendor lists a dependency as "openssl_1.1.1t," another lists it as "OpenSSL 1.1.1t-fips," and a third writes "libcrypto," an automated ingestion engine cannot determine if they are referencing the same physical library. This normalization bottleneck is precisely why organizations like The MITRE Corporation have published extensive frameworks on SBOM data normalization, highlighting the systemic friction of matching disparate vendor datasets to the NVD or CISA's Known Exploited Vulnerabilities (KEV) catalog.

The Transitive Dependency Blindspot

The most severe technical failures occur within transitive dependencies—the libraries used by the libraries that the medical device manufacturer actually bought or wrote. When an engineering team imports a commercial software development kit (SDK) to handle wireless connectivity, they are not just importing that SDK; they are importing every open-source package that the SDK vendor relied upon. If the SDK vendor used an outdated, vulnerable version of a TCP/IP stack, that vulnerability is inherited by the medical device. If the primary manufacturer's SBOM tool only scans top-level dependencies, these deep-seated risks remain entirely invisible until an active exploit occurs on the hospital network.

"An SBOM that only lists top-level components is not a security tool; it is a compliance shield that leaves the hospital blind to the nested supply chain risks running in their clinical suites."

The Economic Asymmetry of FDA Section 524B Compliance

The current medical device security market is defined by a profound economic imbalance. Under Section 524B of the FD&C Act, the FDA has the authority to reject premarket notifications—such as 510(k) submissions—if a manufacturer fails to provide an SBOM and a plan to identify and address postmarket vulnerabilities. This regulation was intended to secure the healthcare supply chain. In practice, however, it has created a compliance-driven market where manufacturers optimize for regulatory approval rather than operational utility.

Device manufacturers capture the economic benefits of using open-source software to slash R&D cycles and rush connected hardware to market. Yet, once those devices are deployed on a clinical network, the financial responsibility for monitoring, triaging, and mitigating vulnerabilities shifts entirely to the healthcare delivery organization. When a new vulnerability is disclosed, the hospital's security team must determine if the affected component is active, network-reachable, and exploitable within their specific deployment. This requires significant engineering hours and specialized tooling, such as the recently launched ICS SBOMGuard or integration platforms like Enlil and Interlynk, which attempt to bridge the security gap for Software as a Medical Device (SaMD) and connected hardware.

To defer the cost of patching, manufacturers frequently utilize Vulnerability Exploitability eXchange (VEX) documents. VEX is designed to allow manufacturers to state whether a specific vulnerability in an SBOM actually affects the device. In a well-functioning ecosystem, a VEX file saves time by telling a hospital CISO, "Yes, this library is present, but the vulnerable code path is unreachable, so no action is required." In reality, manufacturers often use VEX as a liability shield, classifying vulnerabilities as "under investigation" or "not affected" without providing empirical validation, leaving clinical networks exposed while the vendor avoids the expense of developing, testing, and distributing a firmware patch.

Where the Paperwork Actually Holds Up: The Value of Standardized Triage

Despite the operational friction, it would be a mistake to dismiss SBOMs as regulatory theater. There are specific, high-volume scenarios where standardized software inventories perform exactly as intended, saving clinical security teams hundreds of hours during global security incidents. When a zero-day vulnerability like Log4j or a critical OpenSSL flaw drops, the traditional response for a hospital IT team is a chaotic fire drill. Engineers must run active network scans, which can crash sensitive medical hardware, or manually contact dozens of device representatives, waiting weeks for a response.

With an indexed, queryable database of normalized SBOMs, the triage timeline shrinks from weeks to seconds. A CISO can run a single query across their entire active fleet: "Show me every device running OpenSSL version 3.0." The query instantly isolates the exact makes, models, and firmware versions containing the vulnerable library. This allows the security team to implement targeted network segmentations, firewall rules, or micro-segmentation policies immediately, shielding the vulnerable assets without disrupting clinical workflows or waiting for a manufacturer patch that may take six months to arrive.

This rapid triage capability is only possible when both the manufacturer and the hospital commit to standardized formats and automated ingestion. The Linux Foundation's healthcare proof of concept successfully demonstrated that utilizing the SPDX format for medical devices can streamline vulnerability tracking across the lifecycle, provided that the data is continuously updated and integrated into active asset management systems. The value is not in the file itself, but in the automation it enables when a crisis strikes.

Reclaiming the Margins: A Tactical Playbook for Hospital CISOs

Hospital security leaders cannot afford to quietly absorb the operational costs of vendor code debt. To shift the financial and technical burden back to the manufacturers, CISOs must transition from passive consumers of SBOMs to active, contract-enforced gatekeepers. This requires implementing specific, non-obvious strategies at the procurement and operational levels.

1. Premarket Procurement Language: Do not accept generic promises of software security. Every request for proposal (RFP) and capital purchase agreement must include explicit language requiring the vendor to deliver a validated, machine-readable SBOM in SPDX or CycloneDX format, complete with Package URLs (PURLs) and CPE identifiers. The contract must mandate that the vendor update this SBOM every time a software patch, firmware revision, or operating system update is released, free of charge, for the operational life of the equipment.
2. Automated Validation Pipelines: Stop manually reviewing JSON files. Deploy automated ingestion engines that parse incoming vendor SBOMs and cross-reference them against active clinical inventory systems like Asimily, Ordr, or Medigate. These engines should automatically flag incomplete files, missing dependency trees, or non-normalized component names, auto-rejecting shipments or holding up procurement payments until the manufacturer delivers compliant data.
3. Contractual VEX SLA Mandates: Require manufacturers to commit to a strict Service Level Agreement (SLA) for delivering machine-readable VEX files. For any vulnerability rated "Critical" or "High" in the NVD, the vendor must provide a validated VEX document within 15 business days of public disclosure, detailing whether the vulnerability is exploitable on the device and outlining the specific mitigation steps if it is. Failure to meet this SLA should trigger financial penalties, such as service contract discounts or extended warranties at no cost.

Frequently Asked Questions

What happens to our liability when a vendor's SBOM claims a vulnerability is "not affected" via VEX, but our active network monitoring shows anomalous outbound traffic from that device?

A VEX document is an assertion of exploitability by the manufacturer, not a legal indemnity waiver for the hospital. If your active network monitoring or intrusion detection system flags anomalous, malicious, or unauthorized outbound traffic from a device, that operational reality overrides any static VEX claim. In the eyes of the Joint Commission and OCR under HIPAA security rules, the hospital remains responsible for securing its network environment. You must immediately isolate the device using micro-segmentation, initiate an incident response investigation, and document the empirical evidence of compromise to force the manufacturer to re-evaluate their exploitability assessment.

How do we handle legacy, pre-2023 medical devices that have no SBOM and are running on obsolete operating systems like Windows XP or embedded VxWorks?

Legacy devices that predate the FDA's Section 524B mandate will never receive a manufacturer-provided SBOM. For these assets, the hospital must generate "third-party" or "passive" SBOMs using binary analysis tools or network traffic analysis platforms that fingerprint the device's software stack based on its network behavior. Once fingerprinting is complete, these legacy devices must be placed into strict, zero-trust network enclaves. Because you cannot patch the underlying code debt, your only defense is to minimize the device's blast radius by blocking all non-essential protocol traffic and restricting access exclusively to the specific clinical servers required for operation.

Why can't we just use active network vulnerability scanners to find these third-party libraries instead of relying on the vendor's SBOM?

Active network vulnerability scanners rely on sending probes to open ports and analyzing the responses, which is a highly dangerous practice on clinical networks. Active scanning frequently causes legacy medical hardware—such as infusion pumps, anesthesia machines, and patient monitors—to freeze, reboot, or drop network connectivity entirely, directly threatening patient safety. Furthermore, network scans can only identify software that is actively listening on a network interface; they cannot detect vulnerable libraries buried deep within compiled local binaries, offline databases, or internal firmware files that do not expose a network port. A comprehensive SBOM provides this deep visibility without risk to patient care.

If a vendor provides an SBOM in a proprietary or non-standard format, does that constitute a violation of FDA Section 524B?

While the FDA's Section 524B guidelines strongly encourage the use of industry-standard, machine-readable formats like SPDX or CycloneDX, the regulatory text is primarily focused on the manufacturer's ability to demonstrate a secure product lifecycle and provide a functional software inventory. However, submitting a completely proprietary, non-standard text file can be challenged during premarket review if it fails to meet the basic criteria of a usable SBOM, such as identifying component names, versions, and dependencies. For hospitals, accepting a proprietary format is an operational failure; even if the FDA clears the device, your procurement team should reject the purchase until the vendor delivers standard, ingestible data.

The ultimate promise of the medical device SBOM is not the elimination of software vulnerabilities, but the radical transparency required to manage them without bankrupting clinical operations. Until hospital procurement teams refuse to accept un-normalized, incomplete software inventories, manufacturers will continue to externalize their engineering costs, leaving clinical security teams to pay the price for vendor code debt.

References & Further Reading

This explainer is synthesized directly from active reporting and the Source Data above.

• Linux Foundation: Healthcare industry proof of concept successfully uses SPDX as a software bill of materials format for medical devices. (August 5, 2020)
• Endor Labs: SBOM Requirements for Medical Devices under FDA Section 524B guidelines. (December 5, 2023)
• HealthTech Magazine: 5 Questions About SBOMs for Healthcare Organizations. (July 10, 2023)
• ICS: ICS launches SBOMGuard SBOM tool for med device security. (December 10, 2025)
• Enlil and Interlynk: Partnership to Close the Cybersecurity Gap for SaMD and Connected Medical Devices. (January 28, 2026)
• The MITRE Corporation: Considerations for Managing Challenges in Software Bill of Materials (SBOM) Data Normalization. (April 22, 2026)

Related from this blog

• IoMT Security Playbook: Balancing Network vs Device Defense
• Hospital Network Threat Detection: The High Cost of Half-Measures
• IoMT Security: The Costly Reality Behind Vendor Promises

Sources

• Enlil and Interlynk Partner to Close the Cybersecurity Gap for SaMD and Connected Medical Devices - PR Newswire — PR Newswire
• ICS launches SBOMGuard SBOM tool for med device security - Medical Design & Outsourcing — Medical Design & Outsourcing
• SBOM Requirements for Medical Devices - Endor Labs — Endor Labs
• Considerations for Managing Challenges in Software Bill of Materials (SBOM) Data Normalization - The MITRE Corporation — The MITRE Corporation
• Healthcare industry proof of concept successfully uses SPDX as a software bill of materials format for medical devices - Linux Foundation — Linux Foundation
• 5 Questions About SBOMs for Healthcare Organizations - HealthTech Magazine — HealthTech Magazine