CVE-2026-51651
Deferred Deferred - Pending Action

Incorrect Access Control in TOTOLINK T6 Firmware

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: MITRE

Description
Incorrect access control in the getSmartQosCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain Smart QoS configuration and rules via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-08-29
AI Q&A
2026-08-29
EPSS Evaluated
N/A
NVD
CVE-2026-51651
EUVD
EUVD-2026-67883

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 getSmartQosCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to retrieve Smart QoS configuration and rules 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 sent to /cgi-bin/cstecgi.cgi with parameters targeting the getSmartQosCfg function. Check server logs for unauthorized access attempts or unusual POST requests.

Impact Analysis

An attacker could exploit this to gain sensitive network configuration details, potentially leading to further attacks like traffic manipulation or denial of service. Unauthorized access to QoS settings may disrupt network performance or allow interception of network traffic.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Restrict access to /cgi-bin/cstecgi.cgi via firewall rules. Disable unnecessary services and monitor for suspicious activity.

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