Hackers exploited the CVE-2014-9222 flaw, also known as Misfortune Cookie, to hack thousands of home routers and abuse them for WordPress attacks. The attacks were launched from more than 10,000 IP addresses in Algeria, most of which were associated with state-owned telecoms company Telecom Algeria. In just three days, 6.7 percent of all attacks aimed at protected WordPress websites came from home routers that have port 7547 open. The flaw was reported in December 2014 by researchers at Check Point Software Technologies who discovered that more than 12 million Home Routers were affected.”]
Source: https://securityaffairs.co/wordpress/57961/hacking/wordpress-attacks-routers.html