CVE-2026-51695
Received Received - Intake

Incorrect Access Control in TOTOLINK T6 Router Firmware

Publication date: 2026-08-31

Last updated on: 2026-08-31

Assigner: MITRE

Description
Incorrect access control in the setDdnsCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to alter dynamic DNS 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-2026-51695
EUVD
EUVD-2026-68590

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 setDdnsCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to change the dynamic DNS configuration 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 setDdnsCfg. Check for unauthenticated access attempts or unexpected changes to dynamic DNS settings.

Impact Analysis

An attacker could exploit this to alter your device's dynamic DNS settings, potentially redirecting traffic or disrupting network services. This may lead to loss of control over your network configuration and expose you to further attacks.

Compliance Impact

This vulnerability allows unauthenticated attackers to alter dynamic DNS state via crafted POST requests, which could lead to unauthorized changes in network configurations. Such unauthorized access may violate compliance requirements for data integrity and access control in standards like GDPR and HIPAA.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version to address the incorrect access control in setDdnsCfg. If an update is not available, consider disabling dynamic DNS functionality or restricting access to the /cgi-bin/cstecgi.cgi endpoint via network firewall rules.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-51695. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart