Chinese state-sponsored hackers have been exploiting publicly-known vulnerabilities to compromise major telecommunications companies and network service providers.
The 16 most concerning vulnerabilities date back to between 2017 and April last year and, say the agencies, have been comparatively easy to exploit.
The credentials were then used with custom automated scripts to establish the current configuration of each router; the attackers could then successfully authenticate and execute router commands to route, capture, and steal data.
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