CVE-2026-51648

Deferred Deferred - Pending Action

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 getWanInfo function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain WAN information returned by the endpoint 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-2026-51648

EUVD

EUVD-2026-67918

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 getWanInfo function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to retrieve WAN information by sending a specially crafted POST request to the /cgi-bin/cstecgi.cgi endpoint.

Detection Guidance

To detect this vulnerability, check if the affected TOTOLINK T6 device (version 4.1.5cu.748_B20211015) responds to crafted POST requests sent to /cgi-bin/cstecgi.cgi. Use network scanning tools like curl to send a test request and verify if WAN information is returned without authentication.

Impact Analysis

An attacker could exploit this to obtain sensitive network configuration details such as IP addresses, subnet masks, and routing information without authentication. This could aid further attacks like network reconnaissance or unauthorized access to other systems.

Mitigation Strategies

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

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