The high-severity RCE flaw is in the KCodes NetUSB kernel module, used by popular routers from Netgear, TP-Link, DLink, Western Digital, et al.
https://threatpost.com/millions-routers-exposed-bug-usb-module-kcodes-netusb/177506/
The accounts were used to catfish security researchers into downloading malware in a long-running cyber-espionage campaign attributed to North Korea.
https://threatpost.com/twitter-suspends-security-researchers/175524/