CVE-2026-51701

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 setMacFilterRules function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to change device access control via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-31

Last Modified

2026-09-01

Generated

2026-09-20

AI Q&A

2026-08-31

EPSS Evaluated

2026-09-15

NVD

CVE-2026-51701

EUVD

EUVD-2026-68649

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 setMacFilterRules function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to modify device access control settings by sending a specially crafted POST request to the vulnerable endpoint /cgi-bin/cstecgi.cgi.

Detection Guidance

Detecting this vulnerability requires checking for unauthorized changes to MAC filter rules via crafted POST requests to /cgi-bin/cstecgi.cgi. Monitor network traffic for POST requests to this endpoint and inspect logs for unusual access control modifications.

Impact Analysis

An attacker could exploit this to bypass access controls on the device, potentially allowing unauthorized network access or manipulation of security settings without authentication.

Compliance Impact

This vulnerability allows unauthenticated attackers to bypass access controls, potentially enabling unauthorized access to sensitive data or device settings. Such access could violate compliance requirements under GDPR (data protection) and HIPAA (healthcare data security) by exposing personal or protected information without proper authorization.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Disable remote administration if not needed and restrict access to the web interface via firewall rules. Monitor for unauthorized POST requests to /cgi-bin/cstecgi.cgi.

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