CVE-2026-51665

Deferred Deferred - Pending Action

Incorrect Access Control in TOTOLINK T6 Firmware

Publication date: 2026-08-28

Last updated on: 2026-09-01

Assigner: MITRE

Description

Incorrect access control in the getTracerouteCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain traceroute diagnostic logs via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-28

Last Modified

2026-09-01

Generated

2026-09-18

AI Q&A

2026-08-29

EPSS Evaluated

2026-09-15

NVD

CVE-2026-51665

EUVD

EUVD-2026-68005

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 getTracerouteCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to access traceroute diagnostic logs by sending a specially crafted POST request to the vulnerable endpoint /cgi-bin/cstecgi.cgi.

Detection Guidance

To detect this vulnerability, monitor network traffic for POST requests to /cgi-bin/cstecgi.cgi with parameters related to traceroute diagnostic logs. Check server logs for unauthorized access attempts or unusual POST requests targeting this endpoint.

Impact Analysis

An attacker could exploit this to retrieve sensitive network diagnostic information without authentication. This may expose internal network details, potentially aiding further attacks or reconnaissance of the network environment.

Compliance Impact

The vulnerability allows unauthenticated access to diagnostic logs, which could expose sensitive network information. This may violate data protection requirements under GDPR or HIPAA if such logs contain personal or health-related data.

Mitigation Strategies

Immediately update TOTOLINK T6 firmware to the latest patched version. Disable unnecessary services or endpoints if an update is not available. Restrict access to /cgi-bin/cstecgi.cgi via network firewall rules until a fix is applied.

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