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Supplier Security Questions for Evidence-Backed Assurance

Use these questions when asking suppliers for evidence-backed answers rather than unsupported security assertions.

The questions can support procurement, supplier assurance, product acceptance, audit readiness, update review, vulnerability response, and lifecycle monitoring. They are most useful when tied to a specific supplier, product, component, firmware version, service, release, lifecycle state, or assurance decision.

Use this page for request wording. Use the Evidence Checklist to judge the response, and the Evidence Package Template to retain the decision, evidence, gaps, exceptions, and verification notes.

How to use these questions​

Start with the decision you need to make:

  • Are we willing to approve this supplier?
  • Can we accept this product or batch?
  • Is this update ready to deploy?
  • Is this vulnerability response sufficient?
  • Can this evidence support audit, customer assurance, or later lifecycle review?

Then ask for five things:

  1. the artifact or record;
  2. the product, component, service, release, or lifecycle scope;
  3. the owner or producer;
  4. the verification path;
  5. the retention expectation.
Request pattern

Ask for the artifact, owner, scope, lifecycle stage, retention expectation, and verification path. A useful answer should explain not only what the supplier does, but what evidence exists and how a recipient can rely on it.

Supplier and product identity​

Identity evidence helps show who or what is being assessed. It does not prove integrity, vulnerability status, or provenance by itself.

  • What identity evidence can you provide for the supplier, product, device, platform, component, or service?
  • Who issued the identity evidence, and what is it bound to?
  • How should the recipient verify the issuer, binding, scope, and freshness?

Provenance and chain of custody​

Provenance evidence helps explain origin, custody, and supplier path. It is useful only when records are tied to the product, component, service, or lifecycle event being assessed.

  • What provenance records are available, and how far through the supply chain do they extend?
  • What chain-of-custody records exist for logistics, resale, integration, repair, or transfer?
  • Which supplier, reseller, integrator, repair, or transfer events are not covered by the available records?

Component transparency​

Transparency artifacts help identify software, firmware, hardware, service, and dependency scope. They do not prove those components are safe, current, authentic, or acceptable by themselves.

  • What SBOM, firmware BOM, hardware BOM, or xBOM artifacts are available?
  • How are artifacts tied to product versions, firmware versions, builds, or configurations?
  • How are artifacts updated after product changes?
  • What known limitations or exclusions apply?

Integrity and attestation​

Integrity and attestation evidence can help compare current or delivered state with an expected state. It still needs reference values, verifier policy, and response handling for unexpected results.

  • What evidence shows firmware, software, configuration, or platform state is expected?
  • Are reference measurements, signed manifests, measured boot logs, or attestation results available?
  • Who verifies the evidence, when, and using what policy or trust anchor?
  • How fresh must the evidence be for acceptance or operation?

Updates and vulnerability response​

Update and vulnerability evidence helps show whether known changes and exposures are authorized, tracked, remediated, communicated, or accepted as risk.

  • How are updates authorized, signed, delivered, installed, recorded, and rolled back?
  • What records show update history for this product or version?
  • How are vulnerabilities tracked, remediated, accepted, mitigated, or communicated?
  • Can vulnerability status be connected to SBOM/xBOM artifacts and product versions?

Lifecycle state and retention​

Lifecycle evidence helps keep decisions reviewable after deployment, update, repair, transfer, revocation, or decommissioning.

  • What evidence is retained after deployment, update, repair, transfer, revocation, or decommissioning?
  • How are credentials revoked, rotated, or re-issued after lifecycle changes?
  • What evidence can be reused for audit or customer assurance later?

Weak and stronger request wording​

Weak request:

Confirm that your products are secure.

Stronger request:

Provide product-scoped evidence for the device, firmware release, update service, and critical sub-tier dependencies under review. Include the available artifacts, who produced them, what they are bound to, how they can be verified, known gaps, and how long the evidence will be retained.