CVE-2026-51747
Received Received - Intake

Incorrect Access Control in TOTOLINK T6 Firmware via MQTT Message

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: MITRE

Description
Incorrect access control in the keepAlive function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to emit indirect mesh heartbeat information toward the master 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-2026-51747
EUVD
EUVD-2026-69207

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 involves incorrect access control in the keepAlive function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. An unauthenticated attacker can exploit it by sending a specially crafted MQTT message to the cs_broker component. This allows the attacker to send indirect mesh heartbeat information to the master device.

Impact Analysis

An attacker could use this flaw to send unauthorized heartbeat signals, potentially disrupting the mesh network or gaining control over the master device. This may lead to network instability or unauthorized access to connected systems.

Mitigation Strategies

Immediately update TOTOLINK T6 firmware to the latest patched version. Disable unnecessary MQTT services on the device if possible. Monitor network traffic for unusual MQTT messages directed at the cs_broker component.

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