CVE-2026-51649

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 getDiagnosisCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain diagnostic configuration and ping log contents 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-2026-51649

EUVD

EUVD-2026-67885

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 getDiagnosisCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to retrieve sensitive diagnostic configuration and ping log contents by sending a specially crafted POST request to the /cgi-bin/cstecgi.cgi endpoint.

Detection Guidance

To detect this vulnerability, monitor network traffic for POST requests sent to /cgi-bin/cstecgi.cgi with parameters targeting the getDiagnosisCfg function. Check server logs for unauthorized access attempts or unusual diagnostic data retrievals.

Impact Analysis

An attacker could exploit this to access internal network diagnostics and logs without authentication. This may reveal network topology, device configurations, or other sensitive operational details that could aid further attacks against the device or connected systems.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest patched version. Block external access to /cgi-bin/cstecgi.cgi via firewall rules. Disable unnecessary services and restrict network access to trusted IPs only.

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