Is availability_zones enforced for CIS AWS Benchmark v6.0.0?

Yes, This control checks whether high availability is enabled for your RDS DB clusters. RDS DB clusters should be configured for multiple Availability Zones to ensure availability of the data that is stored.

terraform-aws-modules/rds-aurora/aws for CIS AWS Benchmark v6.0.0

Controls

3 controls from CIS AWS Benchmark v6.0.0 apply to this module.

Control	Clause	Change
RDS DB clusters should have automatic minor version upgrade enabledrds_db_cluster_automatic_minor_version_upgrade_enabled None	None
RDS DB clusters should be configured for multiple Availability Zonesrds_db_cluster_multiple_az_enabled None	None
VPC security groups should not allow ingress from 0.0.0.0/0 to remote server administration ports (IPv4)vpc_security_group_remote_administration_ipv4 None	None