- Rely on the platform's isolation and object-reuse mechanisms and keep them patched rather than attempting to build equivalents.
- Check the human-scale versions of the same failure: storage reallocated between projects without sanitization, virtual disks recycled between tenants, shared drives whose permissions outlived their purpose.
03.13.04OFFICIAL TITLEPENDING NIST SME REVIEW
03.13.04 — Information in Shared System Resources
03.13 System and Communications Protection · NIST SP 800-171 Rev. 3
Independent summary of the official requirement
Requires preventing unauthorized and unintended information transfer via shared system resources — residual information left in memory, storage, or other resources that a subsequent user or process could access.
Rev. 3 requirement text is multi-part and parameterized with organization-defined values, so this site summarizes rather than reproduces it. The summary is independent — read the official publication for the binding wording.
NIST SP 800-171 Rev. 3 — Protecting CUI in Nonfederal Systems ↗NIST SP 800-171A Rev. 3 — Assessing Security Requirements for CUI ↗Independent interpretation
What this requirement is after
Memory, storage blocks, and processor registers get reused constantly; what the last process left behind must not be readable by the next one. Modern operating systems and hypervisors provide this largely by construction — the practical work is not defeating it with reallocated disks that were never sanitized, shared folders with stale permissions, or multi-tenant services that mix data between customers.
Mapped practices
Brilliant at the Basics practices that support this requirement
No practice maps to this requirement — deliberately.
The campaign’s twenty practices are a priority list, not a control catalog, and none of them works this requirement’s substance directly. It still applies to you if it is in your contract’s scope: address it through your own implementation and the related artifacts below, and treat the absence of a mapping here as honesty, not permission to skip it.
Doing the work
Implementation considerations and evidence
- Platform documentation or configuration for isolation and object-reuse protection in the operating environment
- Sanitization or release procedures for storage moved between uses
Artifacts
Templates and worksheets with a mapped relationship
No artifact in the library names this requirement yet. The library index groups everything by category and practice.
The other revision
Where this came from in Rev. 2
Provenance
Sources and review status
| Primary sources | NIST SP 800-171 Rev. 3 — Protecting CUI in Nonfederal Systems · NIST SP 800-171A Rev. 3 — Assessing Security Requirements for CUI |
|---|---|
| Review status | Pending NIST SME review |
| Content version | 1.0 |
| Updated |