Start with a reliable inventory of your organization’s assets and the software versions on them, then compare that information with current vendor advisories and vulnerability data. A scanner can help, but its findings are only as complete as its access, coverage, software identification, and detection content. Treat results as leads to validate—not proof that every affected system was found.
What you need to establish
A defensible check answers four questions: which assets are in scope, what software and versions they run, which known vulnerabilities may apply, and whether remediation succeeded. Include the environments your organization actually operates: user endpoints, servers, cloud workloads, network appliances, containers or other software-defined infrastructure, and operational technology (OT) where present.
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Assign owners for the inventory and for the assets it covers. NIST’s component-inventory guidance calls for reviewing inventories at an organization-defined frequency and updating them when components are installed, removed, or updated. Keep enough information to investigate and act: asset identifier, location or environment, owner, product identity and version, detection time and collection source, and remediation status. CISA’s Log4Shell incident guidance also illustrates the value of recording update timestamps, responsible people, privilege context, and an asset’s position in the enterprise topology; those are useful examples, not a universal required schema.
Discover assets with methods suited to your environment
No single discovery channel is guaranteed to see everything. CISA identifies active scanning, passive flow monitoring, log queries, and APIs for software-defined infrastructure as ways to discover assets. Reconcile results with other records—such as endpoint management, cloud inventories, procurement, and configuration management—to identify gaps and stale entries.
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- Active network discovery: Can reveal hosts and exposed services, but an unauthenticated scan may not identify all installed applications or exact versions.
- Credentialed scans or endpoint clients: Where technically feasible, suitable access can improve identification of installed software, operating-system attributes, missing updates, outdated versions, and misconfigurations.
- Passive telemetry, logs, and APIs: Can help cover assets that are not reached by a conventional scan, including cloud and software-defined environments.
- OT collection: Choose methods with the equipment’s operational constraints in mind. NIST’s OT guidance cautions that active scanning can be disruptive for sensitive devices; assess the collection method and test it appropriately before production use.
Record how often each method runs, which known assets it reaches, and when its vulnerability detection content was last updated. Under CISA Binding Operational Directive 23-01, signature updates for vulnerability detection used to meet that directive must be no less frequent than 24 hours after the vendor’s last signature release. That is a directive-specific federal requirement, not a universal cadence for every organization.
Identify products and versions precisely
Capture a readable product name and, when available, a structured machine-readable identity. Include vendor, product, edition, platform, version, and build or patch level where the data supports it. Similar product names, vendor-specific backports, and different editions can make a bare version string ambiguous.
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NIST describes Software Identification (SWID) tags as structured documents that identify products, characterize versions, list artifacts, and describe relationships and metadata. SWID information can support software asset management, vulnerability assessment, missing-patch detection, and integrity verification. NIST’s SCAP v2 FAQ describes SCAP as specifications for exchanging security-automation content used in compliance assessment and detection of vulnerable software versions; it also explains that CPE is a software identifier, not an inventory standard.
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For purchased, open-source, or in-house software, collect software bills of materials (SBOMs) where applicable. NIST’s supply-chain guidance discusses SPDX, CycloneDX, and SWID formats in the federal acquisition context and recommends cataloging SBOMs where practical. An SBOM can describe components and their relationships, but it does not by itself establish which build or component versions are currently deployed on a particular asset. Link SBOM data to deployed versions and asset records.
Compare inventory with vulnerability information
- Choose maintained sources. Use relevant vendor security advisories and established vulnerability feeds for the software in scope.
- Match the software identity. Resolve vendor, product, edition, platform, and component details before comparing versions.
- Check affected-version conditions. Use the advisory’s affected ranges and conditions; do not assume that every lower version is vulnerable. Vendor backports, configurations, and editions can change whether a finding applies.
- Validate the lead. Confirm that the component is present on the asset, the detected identity and version are credible, and a patch or mitigation applies.
- Preserve comparison evidence. Record the inventory result’s source and timestamp alongside the vulnerability information used, so another reviewer can understand what was compared.
For SBOM-covered software, NIST recommends integrating vulnerability detection with the SBOM repository and aligning results with asset inventory. A component match is a signal to investigate; it is not, by itself, proof that an asset is exposed or affected. The guidance cited here does not prescribe one universal matching algorithm or provide a complete, current vulnerability database.
Prioritize and remediate findings
Prioritize using exposure, exploitability, business criticality, and operational context. CISA’s ransomware guidance emphasizes timely patching for internet-facing software and known exploited vulnerabilities. Follow the supplier’s current affected-version and mitigation guidance, and route changes through the organization’s change process.
- Track confirmed and suspected affected assets, their owners, and remediation state.
- Apply a patch or a documented mitigation, recording what changed and when.
- For systems that cannot be patched promptly, document the reason, risk decision, interim protections, and next review point.
- For legacy software without a supplier SBOM, NIST’s supply-chain material describes binary decomposition to generate one as a possible option when technically and legally feasible. This is an advanced option, not a routine first step.
CISA’s Log4Shell advisory is an incident-specific example of this approach: it recommended identifying likely vulnerable systems, keeping asset and version context, and tracking patched assets. Apply current supplier instructions for the software at issue rather than treating an older incident advisory as a substitute for them.
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After remediation, rescan or use another independent method where possible to confirm that the fix took effect. CISA’s Log4Shell guidance recommends using more than one verification method when possible, monitoring the asset, and watching for vendor updates. Keep records of vulnerable assets and their remediation states so later changes can be audited.
Review exceptions and detection gaps on a cadence suited to your organization’s change rate and risk. NIST leaves inventory review frequency organization-defined; increase checks during an active incident or urgent advisory. Track assets with unknown software identity, stale scan dates, missing credentials, unsupported platforms, or unconfirmed ownership. Compare scanner reach with endpoint, cloud, procurement, and configuration-management records rather than assuming scan coverage equals asset coverage.
Choose collection methods by coverage and operational fit
There is no universally best scanner or collection method. NIST’s practice guide emphasizes choosing products that integrate with existing tools and infrastructure. Compare options against the actual environment and workflow:
| Criterion | What to check |
|---|---|
| Coverage | Whether endpoints, servers, cloud resources, network infrastructure, and OT are represented. |
| Collection method | Whether it uses agents or clients, credentialed or uncredentialed scans, passive telemetry, logs, or APIs—and which environments each method can reach. |
| Version detail | Whether it identifies product, edition, build, patch level, and component versions at the level needed to validate advisories. |
| Freshness | How frequently assets are discovered and vulnerability detection content is updated. |
| Access and integration | Required privileges and integration with inventory, configuration management, patching, and SBOM repositories. |
| Operational impact | Whether scanning or agents could disrupt sensitive production or OT devices, and how the method will be tested. |
| Evidence and workflow | Whether reports expose scope, coverage, detection time, owners, remediation state, and verification results. |
The practical outcome should be a repeatable record of what was checked, what was missed or uncertain, what appears affected, who owns the response, and how a fix was verified—not simply a scanner report.
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