Inventory of Information and Other Associated Assets
Plain English Translation
ISO 27001 Annex A.5.9 requires organizations to create and maintain a comprehensive list of all information assets and associated assets (like devices, software, and physical locations) that have value to the organization. Every asset on this list must have a clear owner responsible for its security. This inventory serves as the foundation for risk management, ensuring you know exactly what you are protecting and who is accountable for it.
Technical Implementation
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Required Actions (startup)
- Maintain a manual spreadsheet listing laptops, SaaS accounts, and key data stores
- Assign ownership of all assets to department heads
Required Actions (scaleup)
- Implement MDM and CSPM tools to automate hardware and cloud asset discovery
- Link asset inventory to the risk register to identify critical assets dynamically
Required Actions (enterprise)
- Integrate CMDB (Configuration Management Database) with automated compliance monitoring
- Automate periodic asset validation workflows for owners to recertify assets
It is an organizational control requiring the development and maintenance of an inventory of information and associated assets, ensuring every asset has an identified owner to ensure accountability.
The inventory should include information assets (databases, files), physical assets (laptops, servers), software assets (licenses, applications), and intangible assets (intellectual property, reputation) relevant to the ISMS.
Asset ownership should be assigned to a specific role or individual who is responsible for the asset's daily management, security, and lifecycle, ensuring accountability rather than just possession.
Assets are typically classified based on their criticality and sensitivity (e.g., Confidential, Internal, Public) to determine the appropriate level of protection required, aligning with control A.5.12.
Key fields usually include Asset ID, Name/Description, Type, Location, Owner, Classification, and Custodian (if different from the owner).
The inventory should be updated continuously as assets are acquired or disposed of, with formal reviews conducted at least annually or when significant changes occur.
Cloud instances (VMs, buckets) and SaaS subscriptions are assets; they must be listed in the inventory with owners, often using automated tools (CSPM) to track dynamic cloud resources.
Auditors look for a complete, up-to-date list of assets, evidence that ownership is assigned and understood, and proof that the inventory matches the reality of what they see during the audit (e.g., observing a laptop and checking if it's on the list).
ISO 27001 A.5.9 breaks down when asset data is scattered across cloud consoles, SaaS admin panels, and user devices, because ownership, location, and lifecycle status drift quickly. WatchDog Security's Asset Inventory helps by continuously discovering multi-cloud and SaaS assets and mapping them to identities and owners, so the register stays current and supports review and recertification workflows.
Auditors typically want to see that the inventory is current, ownership is assigned, and changes are controlled over time—not just a one-time export. WatchDog Security's Compliance Center helps by tying ISO 27001 control 5.9 to evidence collection and gap tracking (for example, showing where required inventory fields or ownership are missing) so you can demonstrate an ongoing, repeatable process during audits.
| Version | Date | Author | Description |
|---|---|---|---|
| 1.0.0 | 2026-02-17 | WatchDog Security GRC Team | Initial publication |
