Description
Incorrect access control in the setWizardCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to reconfigure WAN, Wi-Fi, and device initialization state via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
Published: 2026-08-31
Score: 4.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Unauthorized Configuration Modification
Action: Apply Patch
AI Analysis

Impact

This vulnerability is an incorrect access control flaw in the setWizardCfg function. An attacker who can reach the router’s web interface can send a crafted POST request to /cgi-bin/cstecgi.cgi and change WAN, Wi‑Fi, and device initialization settings. The changes can disrupt network connectivity, expose the device to hostile networks, or reset security settings, thereby undermining confidentiality, integrity, and availability of the device and connected devices.

Affected Systems

The flaw exists in TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. No other product versions are listed.

Risk and Exploitability

Because authentication is not required, any host that can access the device over the network can potentially exploit the flaw. The exploit requires only sending a POST request and does not need special privileges. The CVSS score is 4.3, and the EPSS score is below 1%, indicating a low probability of exploitation. The vulnerability is not listed in the CISA KEV catalog, but the remote, unauthenticated nature and the ability to alter core networking settings suggest that it can have a significant impact if abused.

Generated by OpenCVE AI on September 2, 2026 at 02:48 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade the router to the latest firmware that fixes the setWizardCfg access control issue.
  • Configure firewall or access‑control lists to limit which hosts can reach the router’s management interface.
  • Disable remote management and restrict web‑interface access to the local network only.
  • Monitor router logs for unexpected POST requests to /cgi-bin/cstecgi.cgi.

Generated by OpenCVE AI on September 2, 2026 at 02:48 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 02 Sep 2026 03:15:00 +0000

Type Values Removed Values Added
Title Unauthenticated Access Control Failure Allows Configuration Changes in TOTOLINK T6

Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 31 Aug 2026 15:00:00 +0000

Type Values Removed Values Added
Title Unauthenticated Access Control Failure Allows Configuration Changes in TOTOLINK T6
First Time appeared Totolink
Totolink t6
Weaknesses CWE-284
Vendors & Products Totolink
Totolink t6

Mon, 31 Aug 2026 13:00:00 +0000

Type Values Removed Values Added
Description Incorrect access control in the setWizardCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to reconfigure WAN, Wi-Fi, and device initialization state via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
References

Subscriptions

Totolink T6
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-01T16:02:10.538Z

Reserved: 2026-06-08T00:00:00.000Z

Link: CVE-2026-51666

cve-icon Vulnrichment

Updated: 2026-09-01T16:01:59.979Z

cve-icon NVD

Status : Deferred

Published: 2026-08-31T13:18:21.807

Modified: 2026-09-01T16:17:01.077

Link: CVE-2026-51666

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-02T03:00:13Z

Weaknesses