ping.cgi on NETGEAR DGN2200 devices with firmware through 10.0.0.50 allows remote authenticated users to execute arbitrary OS commands via shell metacharacters in the ping_IPAddr field of an HTTP POST request.
https://www.exploit-db.com/exploits/41394/
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-6077