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Chinese state-sponsored hackers compromised nine major US telecommunications carriers throughout 2024, accessing wiretap systems, call metadata for over a million users, and communications of presidential campaign staff.

Joint CISA/NSA/FBI advisory reveals Chinese state-sponsored group Volt Typhoon has expanded persistent access into US water, energy, and transportation infrastructure, maintaining dormant footholds for 12-18 months undetected.

The Salt Typhoon campaign by Chinese state-sponsored actors compromised major US telecom providers including AT&T, Verizon, and T-Mobile, accessing lawful intercept systems and call metadata in what officials called the worst telecom hack in US history.