CVE-2026-51724
Received Received - Intake

Incorrect Access Control in TOTOLINK T6 Firmware

Publication date: 2026-08-31

Last updated on: 2026-08-31

Assigner: MITRE

Description
Incorrect access control in the delSmartQosCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to remove Smart QoS rules 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-2026-51724
EUVD
EUVD-2026-68671

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 delSmartQosCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to remove Smart QoS rules by sending a specially crafted POST request to the vulnerable endpoint /cgi-bin/cstecgi.cgi.

Detection Guidance

Detecting this vulnerability requires checking for unauthorized POST requests to /cgi-bin/cstecgi.cgi targeting the delSmartQosCfg function. Monitor web server logs for suspicious POST requests to this endpoint. Use network traffic analysis tools like tcpdump or Wireshark to capture and inspect POST requests to /cgi-bin/cstecgi.cgi with parameters related to Smart QoS configuration.

Impact Analysis

If exploited, this vulnerability could allow attackers to disrupt network traffic management by removing QoS rules, potentially causing network congestion or prioritizing malicious traffic. This may affect network performance and reliability for all users connected to the device.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version if a patch is available. Disable remote access to the web interface if not required. Restrict network access to the device's administrative interface using firewall rules. Monitor network traffic for unusual POST requests to /cgi-bin/cstecgi.cgi and block malicious IPs.

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