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Tue, August 26, 2025

Sni5Gect: Novel 5G Sniff-and-Inject Downgrade Attack

🔍 A research team at SUTD's ASSET group released Sni5Gect, an open-source over-the-air toolkit that passively sniffs early 5G signaling and injects crafted payloads before NAS security is established. The framework can crash UE modems, fingerprint devices, bypass some authentication flows, and force downgrades from 5G to 4G without deploying a rogue gNB, with reported injection success rates of 70–90% at up to 20 m. GSMA recorded the issue as CVD-2024-0096.

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