CVE-2026-51677
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 setUPnPCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to change UPnP service 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-2026-51677
EUVD
EUVD-2026-68540

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 setUPnPCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to change the UPnP service state by sending a specially crafted POST request to the endpoint /cgi-bin/cstecgi.cgi.

Detection Guidance

To detect this vulnerability, scan your network for devices running TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. Check if UPnP service is enabled and verify if unauthenticated POST requests to /cgi-bin/cstecgi.cgi can modify UPnP settings.

Impact Analysis

An attacker could exploit this to enable or disable UPnP services on your device without authentication. This might allow them to manipulate network settings, expose internal services to the internet, or disrupt normal device operation.

Compliance Impact

This vulnerability allows unauthenticated attackers to change UPnP service state via crafted POST requests, which could lead to unauthorized network configuration changes. Such access could potentially violate data protection requirements under GDPR or HIPAA by enabling unauthorized access to network services or exposing sensitive data.

Mitigation Strategies

Disable UPnP service on affected devices if not required. Block external access to /cgi-bin/cstecgi.cgi via firewall rules. Update to a patched firmware version once available from TOTOLINK.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-51677. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart