The group has been targeting 'Cisco-specific features' to help it break into US telecommunication networks, according to a new advisory from the FBI and CISA.

Federal authorities urged telecom firms to enhance security after a Chinese hacking campaign accessed private communications of many Americans. The joint alert from U.S. and international partners highlights this extensive cyberespionage's global reach.

The Chinese government espionage campaign that has deeply penetrated more than a dozen U.S. telecommunications companies is the “worst telecom hack in our nation’s history — by far,” a senior U.S. senator told The Washington Post in an interview this week.

Salt Typhoon's breach compromises U.S. telecom giants, including T-Mobile, AT&T, and Verizon. The hack exposes vulnerabilities in U.S. wiretapping systems, threatening national security and potentially the data of millions of Americans. T-Mobile claims limited damage, but the full scope of the breach is still unclear.