The Chinese government has been secretly hacking into more than a dozen major US telecommunications companies, allowing hackers to eavesdrop on real-time audio calls and move between networks to exploit trusted relationships, according to a senior senator. Sen. Mark R. Warner (D-Virginia) described the incident as “the worst telecom hack in our nation’s history — by far”. The intruders remain inside the networks, leaving US companies vulnerable to further exploitation.
Source: https://www.washingtonpost.com/national-security/2024/11/21/salt-typhoon-china-hack-telecom