Risk Assessment

In telecommunications, a Risk Assessment is the evaluation of likelihood and impact of threats against telecom assets such as HLR/HSS/UDM, SS7 and Diameter interconnects, 5G SBA, RAN sites, and OAM. It produces a prioritized risk register used to justify investments in signaling firewalls, IDS, segmentation, and incident response capabilities, and is a building block of frameworks like ISO 27005 and NIST RMF.

Categories: Radio Access NetworkCore NetworkSignaling

Risk Assessment in context

The radio access network is the layer where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations, downgrade attacks and jamming, and defenses hinge on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

The mobile core is where subscriber sessions, mobility and policy live. In 4G it is the EPC (MME, HSS, S/PGW); in 5G it is the Service-Based Architecture with AMF, SMF, UPF, AUSF, UDM and the NRF. Core exposure is the difference between a single-subscriber leak and a fleet-wide breach.

To place Risk Assessment in the wider telecom-security picture, review CAPEX, Telecom Reconnaissance, Patch Management, SOAR, MITRE FiGHT and Telecom Forensics.

Related terms

Related topic hubs

  • Signaling Firewall Unified SS7/Diameter/GTP/SMS signaling firewall framework.
  • 5G Security 5G SBA, SEPP, SUCI, 5G-AKA, N32 and service-based interface security.
  • SS7 Security SS7/MAP/CAP/SCCP attacks and defenses across 2G/3G interconnect.
  • SS7 Firewall GSMA FS.11 category 1/2/3 SS7 message screening at the STP edge.

More from the TelcoSec Glossary

Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.