CVE-2026-51699: TOTOLINK T6 vulnerability
Published Aug 31, 2026
·Updated
Incorrect access control in the setDmzCfg function of TOTOLINK T6 4.1.5cu.748B20211015 allows unauthenticated attackers to expose an internal host 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 access does an attacker need to exploit this issue?
An attacker does not need to authenticate. Exploitation consists of sending a crafted POST request to the device's /cgi-bin/cstecgi.cgi endpoint targeting the setDmzCfg function.
2
What is the practical impact of a successful attack?
A successful attacker can expose an internal host by modifying the router's DMZ configuration. This can make that host reachable through the router in a way not intended by the administrator.
3
Which device and firmware version are identified as affected?
The reported affected product is the TOTOLINK T6 running firmware version 4.1.5cu.748_B20211015.