CVE-2026-51677: TOTOLINK T6 vulnerability
Published Aug 31, 2026
·Updated
Incorrect access control in the setUPnPCfg function of TOTOLINK T6 4.1.5cu.748B20211015 allows unauthenticated attackers to change UPnP service state 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·02:17 PM
Description
Frequently Asked Questions
1
What access does an attacker need to exploit this issue?
No authentication is required. An attacker only needs to be able to send a crafted POST request to the device's /cgi-bin/cstecgi.cgi endpoint.
2
What can an attacker change if exploitation succeeds?
The attacker can change the state of the device's UPnP service through the setUPnPCfg function.
3
Which device and firmware are identified as affected?
The affected product identified in the available data is the TOTOLINK T6 running firmware 4.1.5cu.748_B20211015.