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What a VEX claim says
A Vulnerability Exploitability eXchange (VEX) document communicates a supplier’s assessment of how a vulnerability affects one or more products. In OpenVEX, a document is a sequence of statements that can override or add to earlier information. Each statement therefore needs to be read in its product, vulnerability, and time context—not as an isolated status label. See the OpenVEX Specification v0.2.0.
Status labels depend on the format and profile. OpenVEX uses not_affected, affected, fixed, and under_investigation. CSAF 2.1’s VEX profile requires a product tree, vulnerabilities, and at least one product status: fixed, known affected, known not affected, or under investigation. Do not assume fields or labels serialize identically across implementations; retain the format and profile when comparing. See the CSAF 2.1 standard.
Why a whole-file diff is not enough
A raw text or JSON diff is useful for locating edits, but it does not reliably explain their meaning. Statements may move, formatting may change, or metadata may update while the assessment stays the same. Conversely, a small field edit can alter the supplier’s position for one product release. Compare the claim’s fields, then interpret the result for the affected product and vulnerability.
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Product scope is especially important. A supplier may identify versions individually or define ranges, and different versions can have different statuses. A status change for one release is not automatically a finding about every release or the entire product portfolio. CISA’s VEX Use Case Document discusses product-version enumeration and ranges; CSAF also organizes vulnerability status in relation to products.
What to compare for each claim
- Product identity and version scope: Compare the product and any component or subcomponent identifiers, exact releases or ranges, and whether the affected scope expanded or narrowed. Prefer stable identifiers such as a package URL when one is supplied; keep the original identifiers and range text for auditability.
- Vulnerability identity: Match by CVE or another stable vulnerability identifier, not by a statement’s position in the file.
- Impact status: Record whether the claim is not affected, affected, fixed, or under investigation, using the vocabulary defined by that document’s format or profile.
- Reasoning: For a not-affected claim, compare the status justification and explanatory impact statement. OpenVEX requires a justification or impact statement for this status and recommends machine-readable justification labels, which are more interoperable with automation than free-form text alone.
- Action guidance: For an affected claim, check whether an action statement describes remediation or mitigation, and compare both the guidance and its timestamp.
- Time and revision: Compare issue or update timestamps and document version as distinct fields, alongside the publisher and source document.
A practical claim-level diff workflow
- Parse both revisions into statements. Compare structured claims rather than relying on raw line positions or a file-level change indicator.
- Align corresponding claims. Join on the most stable available product/release identity and vulnerability identifier. Preserve the source identifiers and version-range text, even if you normalize fields for matching.
- Compare fields separately. Track status, product scope, justification or impact explanation, action guidance, timestamps, and document metadata independently.
- Classify each difference. Mark it as an added or removed claim, product-scope change, status change, rationale change, remediation change, or metadata-only change. A single statement can have more than one meaningful field change.
- State the practical effect narrowly. Describe the consequence for the product version and vulnerability actually named in the claim. Do not generalize a release-specific status to versions outside its stated scope.
- Keep provenance with the comparison. Record the publisher, source document and version, issue time, and retrieval time. If revisions appear inconsistent, check the latest authoritative supplier data and the update semantics of the format.
How to tell a new assessment from a new document date
Document metadata can change independently of a claim, and neither a new version number nor a date by itself explains the semantic difference. OpenVEX says the document version must increment when any content changes, so a version increment can reflect a metadata edit as well as a changed assessment. Cisco’s Vulnerability Repository and VEX FAQs explain that a freshly downloaded document can retain an older generation date when its underlying data has not changed. Compare the statements themselves, while keeping document version, issue or update time, and retrieval time distinct.
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A useful comparison report should make the distinction explicit: “metadata-only” means the document details changed but the matched claim fields did not; “assessment change” identifies the claim field that changed and the product scope to which it applies. This avoids treating a download date as proof of a new supplier assessment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What claim-level diffs can—and cannot—automate
Structured VEX statements can automate portions of vulnerability analysis, such as matching supplier claims to products in an inventory and surfacing status changes. They do not remove the need to verify product identity, version applicability, provenance, and the practical meaning of remediation guidance. Machine-readable justifications help tools process claims consistently, but a claim still needs interpretation in the context of the consuming organization’s deployed products and supplier data.
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On September 8, 2026, Microsoft announced that it was publishing VEX statements for all Microsoft-assigned CVEs. The Microsoft Security Response Center described the intended benefits as more consistent machine-readable processing and less manual interpretation in complex environments. This is a vendor statement of intended benefit, not an independently measured result; the announcement illustrates why comparing individual claims matters when consumers handle a large vulnerability portfolio. See Microsoft’s VEX announcement.
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