5G Meets IoT: The New Attack Surface—and a Practical Defense Playbook By CyberDudeBivash • Date: September 21, 2025 (IST)

Executive summary 5G doesn’t just make IoT faster—it reshapes the threat surface . You now have a service-based 5G core (SBA), network slices , multi-access edge compute (MEC) nodes sprinkled across sites, and billions of devices with SIM/eSIM/iSIM identities talking through new exposure APIs. This guide gives security architects a field map of what’s changed and a copy-ready defense playbook you can put to work in 30 days. You’ll get A concise attack-surface map for 5G+IoT (control plane, user plane, edge, device). A reference security architecture (device identity, slice controls, MEC hardening, data zoning). A 30-day hardening sprint , detections , and an RFP checklist to keep vendors honest. TL;DR Treat every device as a principal with verified SIM/iSIM + device cert + attestation . Make slices enforceable security zones (policies, posture scoring, per-slice observability). Turn MEC into a defended micro-datacenter (signed workloads, SB...