CVE-2026-51616

Deferred Deferred - Pending Action

Unauthenticated Access to LAN Configuration in TOTOLINK T6

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: MITRE

Description

Incorrect access control in the getWanIeCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain LAN addressing and DHCP configuration information 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-2026-51616

EUVD

EUVD-2026-67910

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 getWanIeCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to retrieve sensitive LAN addressing and DHCP configuration details 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 to /cgi-bin/cstecgi.cgi with parameters targeting getWanIeCfg. Check server logs for unauthorized access attempts or unusual POST requests from external sources.

Impact Analysis

An attacker could exploit this to gather internal network details like IP addresses, subnet masks, and DHCP settings. This information could be used for further attacks such as man-in-the-middle, lateral movement, or targeted exploits against other devices on the LAN.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Restrict access to /cgi-bin/cstecgi.cgi via firewall rules to prevent external access. Disable unnecessary services and monitor for suspicious activity.

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