A command injection vulnerability was discovered on the Zyxel EMG2926 home router with firmware V1.00(AAQT.4)b8. The vulnerability is located in the diagnostic tools, specifically the nslookup function. A malicious user may exploit numerous vectors to execute arbitrary commands on the router, such as the ping_ip parameter to the expert/maintenance/diagnostic/nslookup URI.
https://www.exploit-db.com/exploits/41782/
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-6884