This rule monitors for changes to EC2 Route tables.
Route tables control the flow of traffic within your AWS environment. Changes to route tables could mean sensitive traffic is routed to systems outside of your control.
If this change was not planned, revert it and investigate the source of the change. Consider modifying permissions to ensure unplanned changes cannot happen again in the future.
CIS AWS Benchmark 3.13: "Ensure a log metric filter and alarm exist for route table changes"