Femtocells Security Implications: Visibility Gap and Risk Mitigation

Femtocells Security Implications: Visibility Gap and Risk Mitigation explains how low‑power cellular base stations extend coverage indoors but create a local cellular network that is hard to monitor. Femtocells connect to the operator’s core network over broadband, broadcast a local signal covering 10–50 m, and devices automatically switch to the strongest signal, regardless of trust. This creates a visibility gap between IP network monitoring and the air interface, making it difficult to detect unauthorized femtocells. Identification relies on signal behaviour: very strong indoor signal, rapid drop outside, isolated Cell ID, and inaccurate location. Security risks include firmware attack surface, potential interception, reliance on broadband, and single operator dependency. Legacy femtocells remain in circulation on secondary markets, posing ongoing threats. Mitigation strategies involve using Wi‑Fi Calling, avoiding unsupported devices, monitoring RF environments, validating unexpected strong indoor signals, and treating local cellular infrastructure as part of the attack surface.