The attackers infiltrated wiretap systems, raising severe national security and privacy concerns. While the FBI and CISA did not list specific providers, the Wall Street Journal reported in early October that AT&T, Verizon, and Lumen Technologies were among the carriers the hackers hit. The intrusions, which may have lasted for months, enabled the exfiltration of sensitive data, including customer call records and the internet traffic of millions of Americans.
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