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State-affiliated Chinese hackers penetrated AT&T, Verizon, Lumen and others; they entered their networks and spent months intercepting US traffic - from individuals, firms, government officials, etc - and they did it all without having to exploit any code vulnerabilities. Instead, they used the back door that the FBI requires every carrier to furnish:

https://www.wsj.com/tech/cybersecurity/u-s-wiretap-systems-targeted-in-china-linked-hack-327fc63b?st=C5ywbp&reflink=desktopwebshare_permalink

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