What evidence do auditors commonly ask for on CA.L2-3.12.3 Security Control Monitoring?

Continuous monitoring strategy naming controls, metrics and frequency; Monitoring output such as dashboards or periodic reports; Records of action taken when monitoring shows degradation.

What is the most common gap auditors find on CA.L2-3.12.3?

Monitoring limited to the annual assessment

CMMC 2.0 · Security Assessment

`CA.L2-3.12.3` Security Control Monitoring

Monitor security controls continuously so their effectiveness is known on an ongoing basis rather than only at assessment time.

Source: CMMC 2.0, CA.L2-3.12.3. 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

SIEM / log platform

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

Monitoring output such as dashboards or periodic reports · SIEM / log platform

periodic reviewEvidence produced at each review

Records of action taken when monitoring shows degradation · SIEM / log platform

governing documentDocuments that govern the control

Continuous monitoring strategy naming controls, metrics and frequency · Policy repository / GRC workspace

First move

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

Common gaps auditors find

Monitoring limited to the annual assessment
Metrics collected but not evaluated against expectations
Degradation detected without follow up

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

CA.L2-3.12.2 Plan of Action · CA.L2-3.12.4 System Security Plan