CVE-2026-51757
Received Received - Intake

Incorrect Access Control in TOTOLINK T6 Firmware

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: MITRE

Description
Incorrect access control in the meshSlaveUpdate function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to start a firmware download or flash workflow on the slave device via sending a crafted MQTT message to the cs_broker component.

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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-2026-51757
EUVD
EUVD-2026-69200

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 meshSlaveUpdate function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to initiate firmware download or flashing processes on the slave device by sending a specially crafted MQTT message to the cs_broker component.

Detection Guidance

Detecting this vulnerability requires monitoring for unauthorized MQTT messages targeting the cs_broker component on TOTOLINK T6 devices. Check device logs for unexpected firmware download or flash workflow initiation without authentication. Inspect network traffic for MQTT messages with crafted payloads sent to the cs_broker topic.

Impact Analysis

An attacker could exploit this to remotely control firmware updates on your device without authentication. This could lead to unauthorized changes, potential device compromise, or denial of service by flashing malicious firmware.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest patched version. Disable unnecessary MQTT services or restrict access to the cs_broker component. Implement network segmentation to isolate vulnerable devices. Monitor for suspicious activity and block unauthorized MQTT traffic.

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