What is Salt Typhoon? A security expert explains the Chinese hackers and their attack on US telecommunications networks

The U.S. says Chinese hackers have penetrated America's phone networks – and are still inside them. Anton Petrus/Moment via Getty Images

Cyberattacks linked to the Chinese government that compromised large portions of the American telecommunications network have the U.S. government sounding the alarm. The chair of the Senate Intelligence Committee, Sen. Mark Warner (D-VA), has called it the “worst telecom hack in our nation’s history” and noted that it makes prior cyberattacks by Russian operatives look like “child’s play” by comparison.

The complex cyberattack, carried out by a group of Chinese hackers dubbed Salt Typhoon, began as far back as 2022. Its purpose, according to U.S. officials, was to give Chinese operatives persistent access to telecommunications networks across the U.S. by compromising devices like routers and switches run by companies like AT&T, Verizon, Lumen and others.