Fuzzing (Telecom Protocols)

Fuzzing is a software testing technique that feeds malformed, unexpected, or random inputs into a program to discover crashes and security vulnerabilities. Telecom protocol fuzzing targets SS7, Diameter, GTP, SIP, and 5G SBA APIs, and has historically uncovered exploitable bugs in core network functions, IMS elements, and signalling firewalls themselves.

Categories: Radio Access NetworkCore NetworkSignaling

Fuzzing in context

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

The mobile core carries subscriber sessions, mobility and policy. 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.

To place Fuzzing in the wider telecom-security picture, review 5G SA, AMF, Base Station (BS), Capacity Planning, CAPEX and CSCF — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

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.