Cybersecurity researchers have disclosed the existence of nearly a dozen security flaws in Linksys routers. Out of 10 security issues (ranging from moderate to critical), six can be exploited remotely by unauthenticated attackers. When exploited, the flaws could allow an attacker to overload the router, force a reboot by creating DoS conditions, deny legitimate user access, leak sensitive data, change restricted settings and even plant backdoors. Many of the active Linksys devices exposed on the internet scanned by Shodan were using default credentials.
Source: https://thehackernews.com/2017/04/linksys-router-hacking.html