IA.L2-3.5.6  

Reference: CMMC 2.11

Family: IA

Level Introduced: 2

Title: Identifier Handling

Practice:
Disable identifiers after a defined period of inactivity.

CMMC Clarification:
Identifiers are uniquely associated with an individual, group, role or device. An inactive identifier is one that has not been used for a certain period of time. For example, a user account may be needed for a certain time to allow for transition of business processes to existing or new staff. Once use of the identifier is no longer necessary it should be disabled and marked for deletion based on policy. Failure to maintain awareness of accounts that are no longer needed yet still active could be used by an adversary to exploit IT services.

Example
You are the IT manager responsible for enforcing your company's inactive account policy: any account that has not been used in the last 45 days must be deleted. You decide to do this by writing a script that runs once a day to check the last login date for each account and generates a report of the accounts with no login records for the last 45 days. After reviewing the report, you notify the employee's supervisor and delete the account.

Source: CMMC v2.0