CVE-2026-51721: TOTOLINK T6 vulnerability
Published Aug 31, 2026
·Updated
Incorrect access control in the setPairCfg function of TOTOLINK T6 4.1.5cu.748B20211015 allows unauthenticated attackers to alter the mesh pairing 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·05:17 PM
Description
Frequently Asked Questions
1
Who is exposed to this issue?
Devices identified as TOTOLINK T6 running version 4.1.5cu.748_B20211015 are affected. An attacker would need network access to the device's web management endpoint at /cgi-bin/cstecgi.cgi.
2
Does exploitation require authentication?
No. The issue allows unauthenticated attackers to alter the mesh pairing state by sending a crafted POST request to the affected CGI endpoint.
3
How can I determine whether a device may be affected?
Check whether the device is a TOTOLINK T6 and whether it runs firmware version 4.1.5cu.748_B20211015. Also review whether its web management interface is reachable by untrusted network users.