Netgear R8500 v1.0.2.160, XR300 v1.0.3.78, R7000P v1.3.3.154, and R6400 v2 1.0.4.128 were discovered to multiple stack overflow vulnerabilities in the component ap_mode.cgi via the apmode_dns1_pri and apmode_dns1_sec parameters. These vulnerabilities allow attackers to cause a Denial of Service (DoS) via a crafted POST request.