5G basics
User Plane Function (UPF)
Description
The UPF (User Plane Function) is the key component of the 5G user plane. It acts as a bridge between the UE and the data network, i.e., the Internet, forwarding data packets between them and applying routing and forwarding policies as needed. For doing so it is configured by the SMF via the N4 interface.
Security importance
The UPF handles the actual user data, e.g., the IP traffic. A compromised UPF implies that the user data of the customers can be intercepted or manipulated. Ensuring the UPF’s integrity shall be the highest priority.