An issue was discovered in Free5GC v4.0.0 and v4.0.1 allowing an attacker to cause a denial of service via the Nudm_SubscriberDataManagement API.
https://github.com/free5gc/free5gc/issues/703
https://github.com/free5gc/free5gc/issues/702
https://github.com/free5gc/free5gc/issues/701