GTP Security (GPRS Tunneling Protocol Security)

GTP security covers the threats and controls on GTP-C (control plane, TS 29.274) and GTP-U (user plane, TS 29.281) at S5/S8, S11, N4, N3/N9 and roaming (GRX/IPX) interfaces: overbilling, TEID guessing, session hijack, GTP-in-GTP tunneling, IMSI/APN enumeration, and DoS. GSMA FS.20 defines category-based screening for GTP firewalls at GRX/IPX borders.

Categories: SignalingRoaming and InterconnectSecurity Controls

GTP Security in context

Signaling protocols carry the control-plane instructions that set up calls, register subscribers, hand over sessions and route SMS. SS7, Diameter, GTP-C and SIP are the four dominant families, and interconnect exposure of any of them is treated by GSMA FS.11 / FS.19 / FS.20 as a top-tier telecom risk.

Roaming and interconnect are where two operators, often with an IPX or GRX carrier in between, exchange signaling and user-plane traffic. Trust boundaries here are the primary attack surface for location tracking, SMS interception and fraud, which is why GSMA now mandates SEPP with PRINS on 5G interconnect.

To place GTP Security in the wider telecom-security picture, review SEPP Security, Diameter Interconnect Security, GTP, GTP Firewall, GTP-C and Inter-PLMN Security.

Related terms

Related topic hubs

  • GTP Security GTP-C/GTP-U threats across S5/S8, N3/N9 and GRX/IPX borders under GSMA FS.20.
  • GTP Firewall GSMA FS.20 GTP-C/GTP-U screening on GRX/IPX borders.
  • Roaming Security IPX/GRX interconnect risk, home-routed vs local-breakout, SEPP.
  • Signaling Firewall Unified SS7/Diameter/GTP/SMS signaling firewall framework.

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