CVE-2026-51764
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 recvSlaveCloudCheckStatus function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to overwrite cloud-result tracking files 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-2026-51764
EUVD
EUVD-2026-69195

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 recvSlaveCloudCheckStatus function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to overwrite cloud-result tracking files 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 network traffic for unexpected MQTT packets to port 1883 or 8883. Inspect logs for recvSlaveCloudCheckStatus function calls or cloud-result file modifications.

Impact Analysis

An attacker could exploit this to manipulate cloud status tracking, potentially causing incorrect system behavior or hiding malicious activities. This may lead to unauthorized control or disruption of the device's cloud connectivity.

Mitigation Strategies

Immediately isolate affected TOTOLINK T6 devices from the network. Disable MQTT services if not required. Apply firmware updates if available. Monitor for suspicious cloud-result file changes. Block external MQTT traffic to the device at the firewall level.

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