free5GC Denial of Service Vulnerability

free5GC is a 5th Generation (5G) mobile core network open source project by free5GC. free5GC version 3.2.1 suffers from a denial of service vulnerability. The vulnerability stems from the program’s failure to properly come out with the wrong NGAP message, which is exploited by attackers to crash the AMF and NGAP decoders via specially crafted NGAP messages.