What evidence do auditors commonly ask for on SC.L2-3.13.16 Data at Rest?

Inventory of locations where CUI is stored at rest; Encryption or equivalent protection configuration at those locations; Evidence of protection coverage including databases, file shares and endpoints.

What is the most common gap auditors find on SC.L2-3.13.16?

Endpoint encryption in place while servers and shares are unprotected

CMMC 2.0 · System and Communications Protection

`SC.L2-3.13.16` Data at Rest

Protect the confidentiality of CUI while it is at rest in storage.

Source: CMMC 2.0, SC.L2-3.13.16. The statement above is our statement of the clause, read from the published text and cited so you can check it against the official text, not the instrument verbatim. Open CMMC 2.0 in the compliance library.

artefacts

held by a system

at each review

moderate

to go live

Cloud console / configuration management

where the evidence lives

teal = a system already holds it · olive = produced at each review. To go live: easy when half or more of the artefacts are already held by a system, moderate from a quarter to a half, hard below a quarter.

These are the artefacts auditors commonly ask for on this requirement, our guidance rather than text from the standard. Your assessor decides what is sufficient in your context, and asks for samples across the period when a report covers one.

system holds itEvidence a system already holds

Encryption or equivalent protection configuration at those locations · Cloud console / configuration management

periodic reviewEvidence produced at each review

Evidence of protection coverage including databases, file shares and endpoints · Endpoint management (MDM / EDR)

governing documentDocuments that govern the control

Inventory of locations where CUI is stored at rest · Policy repository / GRC workspace

First move

Start with the 1 of 3 artefacts that already live in a system (Cloud console / configuration management); keep the periodic reviews but log each one as a dated record with a named reviewer.

Common gaps auditors find

Endpoint encryption in place while servers and shares are unprotected
Storage locations for CUI never fully inventoried
Cloud storage protection assumed from the provider without verification

Do this for your whole sheet

Paste the rows you run your controls from and get this mapping for every control at once, with the periodic-review ones flagged and a first move per row. No account for the first run.

Build my evidence sheet

SC.L2-3.13.15 Communications Authenticity · SI.L2-3.14.1 Flaw Remediation