Insider Threat

Insider threat is the risk that an individual with legitimate access to systems, employee, contractor, third-party support, uses that access maliciously or negligently. In telecom it is particularly impactful because insiders may reach subscriber data, lawful-interception capabilities, or signalling control planes. Mitigations include least privilege, separation of duties, and behavioural monitoring.

Categories: SignalingIdentity and SubscriberThreats and Attacks

Insider Threat in context

Signaling protocols carry the control-plane messages that set up calls, register subscribers 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 as top-tier telecom risk.

Subscriber identifiers (IMSI, SUPI, MSISDN, IMEI) anchor authentication, charging and lawful interception. Any protocol that leaks a permanent identifier is treated as a privacy defect, which is why 5G introduced SUCI concealment on the air interface.

To place Insider Threat in the wider telecom-security picture, review TMSI Reallocation, Traffic Baselining, AAA, Anomaly Detection, Any-Time Interrogation (ATI) and Artificial Traffic Inflation — 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.