CVE-2026-51718

Deferred Deferred - Pending Action

Incorrect Access Control in TOTOLINK T6 Firmware

Publication date: 2026-08-31

Last updated on: 2026-09-01

Assigner: MITRE

Description

Incorrect access control in the delStaticDhcpRules function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to remove static DHCP reservations via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-31

Last Modified

2026-09-01

Generated

2026-09-20

AI Q&A

2026-08-31

EPSS Evaluated

2026-09-15

NVD

CVE-2026-51718

EUVD

EUVD-2026-68677

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 TOTOLINK T6 router firmware version 4.1.5cu.748_B20211015. The flaw exists in the delStaticDhcpRules function, which allows unauthenticated attackers to remove static DHCP reservations 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 targeting the delStaticDhcpRules function. Check system logs for unauthorized removal of static DHCP reservations.

Impact Analysis

An attacker could exploit this to remove static DHCP reservations, potentially disrupting network configurations. This may lead to unauthorized devices gaining or losing network access, causing connectivity issues or enabling further attacks on the network.

Compliance Impact

This vulnerability allows unauthenticated attackers to remove static DHCP reservations, which could disrupt network access controls. Such access control issues may impact compliance with standards requiring strict network access management, but specific effects on GDPR or HIPAA depend on system configuration and data processing context.

Mitigation Strategies

Immediately update TOTOLINK T6 firmware to the latest version. Disable remote administration if not needed. Restrict access to the web interface via firewall rules. Monitor DHCP reservations for unauthorized changes.

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