---
title: "NIST 800-171 3.13.4 (SC.L2-3.13.4): Shared Resources"
description: "NIST SP 800-171 3.13.4 Shared Resources: 1 SPRS point, allowed on a CMMC POA&M. The text, what assessors check and the evidence."
url: https://policycortex.com/nist-800-171/system-and-communications-protection/3.13.4
sealed: 2026-11-11
amended: 2026-11-11
register: nist-800-171/system-and-communications-protection/3.13.4
records: 7
digest: sha3:cd3d095801eb48b2fc78834af6fb0d787754bb5131d2a51a296186c8fd5eb06a
---

# NIST 800-171 3.13.4 (SC.L2-3.13.4): Shared Resources

NIST 800-171 / System and Communications Protection / 3.13.4

"Prevent unauthorized and unintended information transfer via shared system resources." ([NIST SP 800-171 Rev. 2, requirement 3.13.4](https://doi.org/10.6028/NIST.SP.800-171r2))

CMMC Level 2 practice SC.L2-3.13.4.

## What 3.13.4 means in practice

Information left in shared resources, such as memory, caches, temporary files or reused storage, must not leak to the next user or process. Operating systems and cloud platforms handle much of this, but you still confirm the settings and review shared services such as file shares and print queues.

## SPRS points and the CMMC POA&M

- **CMMC Level 2 practice**: SC.L2-3.13.4
- **SPRS points**: 1 point. When it is not met, the DoD Assessment Methodology subtracts 1 from the score of 110.
- **CMMC POA&M**: Allowed. It is worth 1 point, and 32 CFR 170.21(a)(2)(ii) admits requirements worth 1 point. Conditional status also needs a score of at least 88, and the item must be closed within 180 days.

Sources: [NIST SP 800-171 DoD Assessment Methodology, version 1.2.1 (June 24, 2020), Annex A](https://www.acq.osd.mil/asda/dpc/cp/cyber/docs/safeguarding/NIST-SP-800-171-Assessment-Methodology-Version-1.2.1-6.24.2020.pdf); [32 CFR 170.21, Plan of Action and Milestones requirements](https://www.ecfr.gov/current/title-32/section-170.21).

## What an assessor checks for 3.13.4

NIST SP 800-171A gives one determination statement for 3.13.4.

- Determine if unauthorized and unintended information transfer via shared system resources is prevented.

[NIST SP 800-171A (June 2018), assessment objectives for 3.13.4](https://doi.org/10.6028/NIST.SP.800-171A)

## Evidence that shows 3.13.4 is met

- Operating system and platform documentation on clearing memory and storage before reuse.
- Configuration of shared services, such as file share permissions and print queue clearing.
- Provider documentation on residual data protection for the cloud services in use.

## How PolicyCortex gathers the evidence

No PolicyCortex collector reads the evidence for 3.13.4. Your team provides the evidence listed above.

## Related pages

- **Calculator**: [SPRS score calculator: mark 3.13.4 and the other 109 requirements and see the score.](https://policycortex.com/sprs-score-calculator#family-SC)
- **Sample package**: [Sample package: an SSP, a POA&M and an evidence chain the product generated from demonstration data.](https://policycortex.com/sample-package)
- **Family**: [All 16 System and Communications Protection requirements (3.13).](https://policycortex.com/nist-800-171/system-and-communications-protection)
- **Previous**: [3.13.3: Management Separation](https://policycortex.com/nist-800-171/system-and-communications-protection/3.13.3)
- **Next**: [3.13.5: Public-Facing Subnets](https://policycortex.com/nist-800-171/system-and-communications-protection/3.13.5)
- **All requirements**: [All 110 NIST SP 800-171 requirements, by family.](https://policycortex.com/nist-800-171)

Meet the requirement once. Keep the evidence current. [Request Access](https://app.policycortex.com/auth?mode=request-access) · [Book a call](https://policycortex.com/book)

## Register colophon

| Seq | Label | SHA3-256 | Prev |
|---|---|---|---|
| REC 0000 | REQUIREMENT | 070068f5cf01 | ccbf839d2136 |
| REC 0001 | MEANING | f0d163920819 | 070068f5cf01 |
| REC 0002 | POINTS AND POA&M | a99c652d7414 | f0d163920819 |
| REC 0003 | ASSESSMENT OBJECTIVES | 43ce8abae07b | a99c652d7414 |
| REC 0004 | EVIDENCE | 5b54e17d2c76 | 43ce8abae07b |
| REC 0005 | COLLECTORS | 3871873334ba | 5b54e17d2c76 |
| REC 0006 | RELATED | cd3d095801eb | 3871873334ba |

Head sha3:cd3d095801eb48b2fc78834af6fb0d787754bb5131d2a51a296186c8fd5eb06a. Each digest is SHA3-256 over the previous digest, the register key, the record label, and the record copy; a second party can recompute it from this document.