CVE-2026-51703

Deferred Deferred - Pending Action

Incorrect Access Control in TOTOLINK T6 Router

Publication date: 2026-08-31

Last updated on: 2026-09-01

Assigner: MITRE

Description

Incorrect access control in the setWiFiScheduleCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to alter when Wi-Fi is available via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

CVSS Scores

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Meta Information

Published

2026-08-31

Last Modified

2026-09-01

Generated

2026-09-21

AI Q&A

2026-08-31

EPSS Evaluated

2026-09-15

NVD

CVE-2026-51703

EUVD

EUVD-2026-68646

Affected Vendors & Products

Vendor	Product	Version / Range
totolink	t6	4.1.5cu.748_b20211015

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This vulnerability is an incorrect access control issue in the setWiFiScheduleCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to change Wi-Fi availability schedules by sending a specially crafted POST request to the device's web interface endpoint /cgi-bin/cstecgi.cgi.

Detection Guidance

To detect this vulnerability, monitor network traffic for POST requests to /cgi-bin/cstecgi.cgi with parameters related to WiFi scheduling. Check logs for unauthorized changes to WiFi schedules on TOTOLINK T6 devices running firmware 4.1.5cu.748_B20211015.

Impact Analysis

An attacker could exploit this to disable Wi-Fi at critical times, potentially disrupting network-dependent services or security systems. This could lead to loss of connectivity, compromised network integrity, or interference with devices relying on Wi-Fi availability.

Compliance Impact

This vulnerability allows unauthenticated attackers to alter Wi-Fi availability, which could impact network access controls. For compliance with standards like GDPR or HIPAA, such unauthorized access may undermine data protection measures by enabling network disruptions or unauthorized device access.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Disable remote administration if not needed. Restrict access to the device's web interface via network segmentation or firewall rules.

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