CVE-2026-51658

Received Received - Intake

Incorrect Access Control in TOTOLINK T6 Firmware

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: MITRE

Description

Incorrect access control in the getDmzCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain DMZ configuration information via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-28

Last Modified

2026-08-28

Generated

2026-08-29

AI Q&A

2026-08-29

EPSS Evaluated

N/A

NVD

CVE-2026-51658

EUVD

EUVD-2026-67876

Affected Vendors & Products

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

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability is an incorrect access control issue in the getDmzCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to retrieve DMZ configuration details by sending a specially crafted POST request to the vulnerable endpoint /cgi-bin/cstecgi.cgi.

Detection Guidance

To detect this vulnerability, check if your TOTOLINK T6 device running firmware 4.1.5cu.748_B20211015 is accessible via HTTP POST requests to /cgi-bin/cstecgi.cgi. Send a crafted POST request to this endpoint and verify if DMZ configuration details are returned without authentication.

Impact Analysis

An attacker could exploit this to obtain sensitive network configuration information without authentication. This may enable further attacks such as network reconnaissance, lateral movement within the network, or bypassing security controls by leveraging exposed DMZ settings.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. If no update is available, restrict access to the /cgi-bin/cstecgi.cgi endpoint via firewall rules or disable remote administration until a patch is applied.

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