What evidence do auditors commonly ask for on AC.L2-3.1.19 Encrypt CUI on Mobile?

Device encryption configuration and compliance reporting; Evidence of encryption status per enrolled device; Policy identifying which mobile platforms may hold CUI.

What is the most common gap auditors find on AC.L2-3.1.19?

Encryption assumed by default without verification

CMMC 2.0 · Access Control

`AC.L2-3.1.19` Encrypt CUI on Mobile

Encrypt CUI held on mobile devices and mobile computing platforms so the data stays protected if a device is lost or stolen.

Source: CMMC 2.0, AC.L2-3.1.19. 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

easy

to go live

Endpoint management (MDM / EDR)

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

Device encryption configuration and compliance reporting · Endpoint management (MDM / EDR)
Evidence of encryption status per enrolled device · Endpoint management (MDM / EDR)

periodic reviewEvidence produced at each review

none for this control

governing documentDocuments that govern the control

Policy identifying which mobile platforms may hold CUI · Policy repository / GRC workspace

First move

Automate the pull from your Endpoint management (MDM / EDR). Device compliance report from the MDM (encryption, EDR agent, OS version) on a daily pull.

Common gaps auditors find

Encryption assumed by default without verification
Removable storage in mobile devices left unencrypted
Devices holding CUI outside the managed estate

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

AC.L2-3.1.18 Mobile Device Connection · AC.L2-3.1.20 External Connections