CVE-2026-51683: TOTOLINK T6 vulnerability
Published Aug 31, 2026
·Updated
Incorrect access control in the setLanCfg function of TOTOLINK T6 4.1.5cu.748B20211015 allows unauthenticated attackers to alter LAN network configuration via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
Affected Software
1 affected component
TOTOLINK T6=4.1.5cu.748_B20211015
Event History
Aug 31, 2026
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
Description
Frequently Asked Questions
1
Which systems are exposed to this issue?
TOTOLINK T6 devices running firmware version 4.1.5cu.748_B20211015 are identified as affected. The vulnerable functionality is the setLanCfg function exposed through /cgi-bin/cstecgi.cgi.
2
What does an attacker need to exploit it?
An attacker does not need to authenticate. They need to be able to send a crafted POST request to the device’s /cgi-bin/cstecgi.cgi endpoint.
3
What could an attacker change through successful exploitation?
A successful attacker can alter the device’s LAN network configuration.