AT&T is taking action to take down a botnet that had set up shop inside its network, infecting 5,700 VoIP servers that route traffic from enterprise customers to upstream mobile providers. Researchers from Netlab, a network security division of Chinese tech giant Qihoo 360, first discovered what they characterized as a “brand-new botnet” attacking Edgewater Networks devices, using a vulnerability in EdgeMarc Enterprise Session Border Controllers, tracked as CVE-2017-6079.

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