CVE-2026-51709: TOTOLINK T6 vulnerability
Published Aug 31, 2026
·Updated
Incorrect access control in the setWiFiBasicCfg function of TOTOLINK T6 4.1.5cu.748B20211015 allows unauthenticated attackers to reconfigure primary Wi-Fi settings 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
Data Sourced
via NVD·04:18 PM
Description
Frequently Asked Questions
1
What does an attacker need to exploit this issue?
An attacker needs to send a crafted POST request to the router's /cgi-bin/cstecgi.cgi endpoint. The issue is described as unauthenticated, so no valid router credentials are required.
2
Which configuration can be changed through exploitation?
The vulnerable setWiFiBasicCfg function can be used to reconfigure primary Wi-Fi settings.
3
How can I determine whether a device may be affected?
The affected product and version identified in the available data are TOTOLINK T6 running 4.1.5cu.748_B20211015. Devices matching that model and firmware version may be affected.