CVE-2026-51694
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 setStaticDhcpRules function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to add or change static DHCP rules via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

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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-2026-51694
EUVD
EUVD-2026-68589

Affected Vendors & Products

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

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability involves incorrect access control in the setStaticDhcpRules function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. An unauthenticated attacker can exploit it by sending a specially crafted POST request to /cgi-bin/cstecgi.cgi to add or modify static DHCP rules without proper authorization.

Detection Guidance

To detect this vulnerability, monitor network traffic for POST requests to /cgi-bin/cstecgi.cgi with parameters related to static DHCP rules. Check server logs for unauthorized changes to DHCP configurations.

Impact Analysis

An attacker could manipulate DHCP rules to redirect network traffic, intercept communications, or disrupt network services. This could lead to unauthorized access to sensitive data, man-in-the-middle attacks, or denial of service conditions affecting network availability.

Compliance Impact

This vulnerability could lead to unauthorized network access or data interception, violating confidentiality requirements under GDPR and HIPAA. Organizations may face compliance violations, legal penalties, and reputational damage if exploited.

Mitigation Strategies

Immediately update TOTOLINK T6 firmware to the latest version. Restrict access to the /cgi-bin/cstecgi.cgi endpoint via firewall rules. Disable unauthenticated POST requests to this endpoint if possible.

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