Why is 5G security important? We answer this by discussing the components of cellular networks, mobile phone connections, ORAN, 5GC, and MEC. We also explore the unique security challenges of private 5G systems and provide examples. Additionally, we discuss the limitations of traditional IT firewalls and compare cellular network architecture to traditional IT. Finally, we examine a Zero-Day and demonstrate how CT network peculiarities can expose private, isolated subnets of manufacturing plants to attackers.