CVE-2026-51706
Received Received - Intake

Incorrect Access Control in TOTOLINK T6 Router Firmware

Publication date: 2026-08-31

Last updated on: 2026-08-31

Assigner: MITRE

Description
Incorrect access control in the setSmartQosCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to degrade traffic handling via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

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Meta Information

Published
2026-08-31
Last Modified
2026-08-31
Generated
2026-08-31
AI Q&A
2026-08-31
EPSS Evaluated
N/A
NVD
CVE-2026-51706
EUVD
EUVD-2026-68643

Affected Vendors & Products

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

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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 setSmartQosCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to degrade traffic handling by sending a specially crafted POST request to the vulnerable endpoint /cgi-bin/cstecgi.cgi.

Detection Guidance

Detecting this vulnerability requires monitoring for unauthorized POST requests to /cgi-bin/cstecgi.cgi targeting the setSmartQosCfg function. Check web server logs for suspicious POST requests to this endpoint with parameters related to QoS configuration.

Impact Analysis

If exploited, this vulnerability could allow attackers to disrupt network traffic management, potentially causing degraded performance or denial of service for legitimate users on the affected TOTOLINK T6 device.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Block external access to the web interface at the network perimeter. Monitor network traffic for POST requests to /cgi-bin/cstecgi.cgi and disable the setSmartQosCfg function if possible.

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