Reference: CMMC v2.13
Family: AC
Level Introduced: 2
Title: External Connections [CUI Data]
Practice:
Verify and control/limit connections to and use of external systems.
Further Discussion:
Control and manage connections between your company network and outside networks. Outside networks could include the public internet, one of your own company’s networks that falls outside of your CMMC Assessment Scope (e.g., an isolated lab), or a network that does not belong to your company. Tools to accomplish include firewalls and connection allow/deny lists. External systems not controlled by your company could be running applications that are prohibited or blocked. Control and limit access to corporate networks from personally owned devices such as laptops, tablets, and phones. You may choose to limit how and when your network is connected to outside systems or only allow certain employees to connect to outside systems from network resources.
Example
Your company has a project that contains CUI. You remind your coworkers of the policy requirement to use their company laptops, not personal laptops or tablets, when working remotely on the project [b,f]. You also remind everyone to work from the cloud environment that is approved for processing and storing CUI rather than the other collaborative tools that may be used for other projects [b,f].
Potential Assessment Considerations
• Are all connections to external systems outside of the assessment scope identified [a]?
• Are external systems (e.g., systems managed by OSAs, partners, or vendors; personal devices) that are permitted to connect to or make use of organizational systems identified [b]?
• Are methods employed to ensure that only authorized connections are being made to external systems (e.g., requiring log-ins or certificates, access from a specific IP address, or access via Virtual Private Network (VPN)) [c,e]?
• Are methods employed to confirm that only authorized external systems are connecting (e.g., if employees are receiving company email on personal cell phones, is the OSA checking to verify that only known/expected devices are connecting) [d]?
• Is the use of external systems limited, including by policy or physical control [f]?
Implementation Strategies
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800-171 Requirements v2 (1)
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