CVE-2026-51742
Received Received - Intake

Unauthenticated WAN Discovery in TOTOLINK T6 Router

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: MITRE

Description
Incorrect access control in the discoverWan function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to trigger WAN discovery logic via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

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Meta Information

Published
2026-09-01
Last Modified
2026-09-01
Generated
2026-09-01
AI Q&A
2026-09-01
EPSS Evaluated
N/A
NVD
CVE-2026-51742
EUVD
EUVD-2026-69211

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
totolink t6 4.1.5cu.748_b20211015

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is an incorrect access control issue in the discoverWan function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to trigger the WAN discovery logic by sending a specially crafted POST request to the endpoint /cgi-bin/cstecgi.cgi.

Detection Guidance

To detect this vulnerability, monitor network traffic for POST requests to /cgi-bin/cstecgi.cgi with parameters related to WAN discovery. Check logs for unauthenticated access attempts to this endpoint.

Impact Analysis

This vulnerability could allow attackers to remotely trigger network discovery processes without authentication, potentially exposing network configuration details or enabling further attacks on the device or connected systems.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Block external access to /cgi-bin/cstecgi.cgi via firewall rules. Disable unnecessary services exposing this endpoint.

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