CVE-2026-51709

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 setWiFiBasicCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to reconfigure primary Wi-Fi settings 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-2026-51709

EUVD

EUVD-2026-68641

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 setWiFiBasicCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to change primary Wi-Fi settings by sending a specially crafted POST request to the vulnerable endpoint /cgi-bin/cstecgi.cgi.

Detection Guidance

To detect this vulnerability, monitor network traffic for POST requests to /cgi-bin/cstecgi.cgi with parameters targeting setWiFiBasicCfg. Check logs for unauthenticated access attempts to Wi-Fi configuration endpoints.

Impact Analysis

An attacker could exploit this to reconfigure your Wi-Fi network settings, potentially changing the network name, password, or security settings. This could lead to unauthorized access to your network, interception of traffic, or further attacks on connected devices.

Compliance Impact

This vulnerability allows unauthenticated attackers to reconfigure primary Wi-Fi settings, which could lead to unauthorized network access. This may violate data protection requirements under GDPR (e.g., unauthorized access to personal data) and HIPAA (e.g., breaches of protected health information).

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Block external access to the /cgi-bin/cstecgi.cgi endpoint via firewall rules. Disable unauthenticated Wi-Fi configuration changes if possible.

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