CVE-2026-51617

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 getSysStatusCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain sensitive information such as operation mode, firmware version, serial number, WAN/LAN IP addresses, WiFi SSID, encryption keys, and connected client statistics via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

CVSS Scores

EPSS Scores

Probability:
Percentile:

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-2026-51617

EUVD

EUVD-2026-67909

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

Detection Guidance

To detect this vulnerability, monitor network traffic for POST requests to /cgi-bin/cstecgi.cgi. Check if unauthenticated requests are accessing the getSysStatusCfg function. Use tools like tcpdump or Wireshark to capture and analyze HTTP POST requests targeting this endpoint.

Impact Analysis

An attacker could exploit this to obtain sensitive data such as WiFi passwords, network IP addresses, connected devices, firmware details, and serial numbers without authentication. This could lead to further attacks like network compromise or unauthorized access.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Disable remote access to the web interface if not required. Restrict network access to the device using firewall rules. Monitor logs for suspicious POST requests to /cgi-bin/cstecgi.cgi.

Hi! I’m here to help you understand CVE-2026-51617. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70