CVE-2026-51721
Received Received - Intake

Incorrect Access Control in TOTOLINK T6 Firmware

Publication date: 2026-08-31

Last updated on: 2026-08-31

Assigner: MITRE

Description
Incorrect access control in the setPairCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to alter the mesh pairing state via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-08-31
Last Modified
2026-08-31
Generated
2026-08-31
AI Q&A
2026-08-31
EPSS Evaluated
N/A
NVD
CVE-2026-51721
EUVD
EUVD-2026-68674

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
totolink t6 4.1.5cu.748_b20211015

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is an incorrect access control issue in the setPairCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to change the mesh pairing state 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 sent to /cgi-bin/cstecgi.cgi with parameters targeting the setPairCfg function. Check for unauthenticated access attempts to this endpoint.

Impact Analysis

An attacker could exploit this to alter the mesh pairing state of your TOTOLINK T6 device without authentication. This may disrupt network connectivity or allow unauthorized access to connected devices in a mesh network setup.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Restrict access to the /cgi-bin/cstecgi.cgi endpoint via network firewall rules. Disable unnecessary services and monitor for suspicious POST requests.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-51721. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart