CMMC SI.L2-3.14.5: System and File Scanning Requirements
System and file scanning is a foundational defense against malware and unauthorized code execution. SI.L2-3.14.5 requires your organization to run periodic scans of your entire information system while also monitoring files in real-time as they enter your network from external sources. This dual-layer approach catches threats both continuously and comprehensively.
What this means
This control mandates two scanning activities: (1) Scheduled, periodic scans that examine your complete information system for malware, vulnerabilities, and policy violations; and (2) Real-time scanning that automatically checks files as they are downloaded, opened, or executed from external sources. Together, these create a continuous monitoring posture that prevents infected or malicious code from establishing a foothold in your environment.
How to comply
- 1.Deploy endpoint protection software with integrated scanning capabilities on all devices (workstations, servers, laptops)
- 2.Configure automated, recurring scans to run during off-hours at least weekly (daily is stronger); document the schedule
- 3.Enable real-time file monitoring that scans all incoming files from email, downloads, removable media, and network shares before execution
- 4.Maintain current malware definitions and signature databases; configure automatic updates
- 5.Log and review scan results, including detected threats, quarantine actions, and remediation steps
- 6.Test your scanning infrastructure quarterly to ensure both periodic and real-time components function as designed
- 7.Document your scanning policy, tool configurations, and incident response procedures
Evidence auditors look for
- Endpoint protection console showing enabled scheduled scans (weekly or daily frequency)
- Scan logs with timestamps, files scanned, threats detected, and quarantine records
- Real-time protection logs demonstrating file interception on download or execution
- Malware definition update history confirming current threat signatures
- Scan configuration screenshots showing enabled real-time scanning for external file sources
- Incident response records documenting actions taken on detected threats
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
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