CVE-2026-51622

Deferred Deferred - Pending Action

Incorrect Access Control in TOTOLINK T6 Router Firmware

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: MITRE

Description

Incorrect access control in the getWanCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain WAN configuration data 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-2026-51622

EUVD

EUVD-2026-67904

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 getWanCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to retrieve WAN configuration data by sending a specially crafted POST request to the 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 the web interface. Send a crafted POST request to /cgi-bin/cstecgi.cgi and observe if WAN configuration data is returned without authentication.

Impact Analysis

An attacker could exploit this to obtain sensitive network configuration details without authentication. This may enable further attacks like network sniffing, man-in-the-middle attacks, or unauthorized access to connected systems.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. If no update is available, restrict access to the device's web interface via network segmentation or firewall rules. Disable unnecessary services and monitor for unusual POST requests to /cgi-bin/cstecgi.cgi.

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