xernary/cve-2025-63820Proof-of-concept of vulnerability found in Totolink A720R router
Vendor: TOTOLINK
Vendor's website: TOTOLINK
Model: A720R
Firmware version: V4.1.5cu.630_B20250509
Firmware download address: TOTOLINK
When logging into the control panel, the username and password are sent in plain-text:
POST /cgi-bin/cstecgi.cgi HTTP/1.1
Host: 192.168.0.1
Content-Length: 73
X-Requested-With: XMLHttpRequest
Accept-Language: en-US,en;q=0.9
Accept: application/json, text/javascript, */*; q=0.01
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36
Origin: http://192.168.0.1
Referer: http://192.168.0.1/login.html
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
{
"username":"admin",
"password":"admin",
"flag":"0",
"topicurl":"loginAuth"
}
An attacker can intercept and use the credentials to obtain admin access to the router.