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Cybersecurity hazard analysis: from threat to harm to control

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Threat Modeling · Part 3

Cybersecurity hazard analysis: from threat to harm to control

How one row of a medical device cybersecurity hazard analysis links a threat to a patient harm, a security control, and the test that proves it.

Infographic chain of seven steps: threat, vulnerability, CIA loss, hazardous situation, harm rated per ISO 14971, security control, and verification, with shared IDs on every row. — Shared IDs on every row (for example T-07, H-12, C-04, TST-31) let a reviewer follow any threat to its test.

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What the graphic says

The full text version, so the content is readable without the image.

The seven links

How security risk (exploitability) and safety risk (ISO 14971) connect in one row.

1. Threat: A STRIDE threat at a trust boundary.
2. Vulnerability: The weakness that lets the threat succeed.
3. CIA loss: Loss of confidentiality, integrity, or availability.
4. Hazardous situation: The patient is exposed to the hazard.
5. Harm: Severity rated per ISO 14971.
6. Control: A security control reduces the risk.
7. Verification: A test proves the control works.

Keep reading

Cybersecurity hazard analysis for medical devices
Medical device threat modeling service
The four questions (Part 1)

More in Threat Modeling

Infographic: the four threat modeling questions - what are we working on, what can go wrong, what are we going to do about it, and did we do a good enough job - each with the artifacts it produces.

Part 1

Underneath it all, four questions

Infographic: the nine-step medical device threat modeling workflow mapped to the four questions, from scoping and the DFD through STRIDE, attack trees, controls, testing, and the residual risk QA gate.

Part 2

Four questions, nine steps

Infographic of CVSS 4.0 Base, Threat, Environmental, and Supplemental metric groups, plus an illustrative infusion pump vulnerability with vector AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N scoring 8.7 High.

CVSS 4.0 at a glance, with a medical device example

Infographic of a device, phone app, and cloud separated by trust boundaries, with six STRIDE cards: spoofing, tampering, repudiation, information disclosure, denial of service, and elevation of privilege, each with the property it breaks and a device example.

STRIDE threats on a connected medical device

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MedTech Cybersecurity · Since 2022