CVE-2026-51661: TOTOLINK T6 vulnerability
Published Aug 28, 2026
·Updated
Incorrect access control in the getPortForwardRules function of TOTOLINK T6 4.1.5cu.748B20211015 allows unauthenticated attackers to obtain port-forwarding rules 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 28, 2026
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
Description
Frequently Asked Questions
1
Who is exposed to this issue?
TOTOLINK T6 devices running firmware version 4.1.5cu.748_B20211015 are identified as affected. An attacker can query the vulnerable CGI endpoint without authentication.
2
What does an attacker need to exploit it?
The attacker needs to send a crafted POST request to /cgi-bin/cstecgi.cgi that invokes the getPortForwardRules function. No valid login credentials are required.
3
What information can be obtained?
Successful exploitation allows retrieval of the device's port-forwarding rules. These rules may reveal services and internal destinations configured for external access.