Description
Incorrect access control in the getLanCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain LAN addressing and DHCP configuration information via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
Published: 2026-08-28
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: Unauthorized Disclosure of LAN Configuration
Action: Patch Now
AI Analysis

Impact

The vulnerability is an incorrect access control in the getLanCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. A crafted POST request to /cgi-bin/cstecgi.cgi allows any unauthenticated user to retrieve LAN addressing and DHCP configuration data, exposing sensitive network configuration.

Affected Systems

TOTOLINK T6 routers running firmware 4.1.5cu.748_B20211015 are affected. No other product versions are listed in the CNA data.

Risk and Exploitability

An attacker with network access to the device can exploit this flaw by sending a simple HTTP POST request, circumventing authentication entirely. The CVSS score is 7.5, the EPSS score is less than 1%, and the vulnerability is not listed in the CISA KEV catalog; the information disclosure can aid attackers in mapping the network, potentially escalating to further attacks.

Generated by OpenCVE AI on September 2, 2026 at 07:27 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Obtain and install the latest firmware from the vendor that addresses the access control issue.
  • Restrict network access to the router's management interface by configuring firewall rules or placing the device on a separate VLAN.
  • Disable or remove the /cgi-bin/cstecgi.cgi endpoint if not required, or enforce authentication on that endpoint via HTTP Basic/Digest or ACL.

Generated by OpenCVE AI on September 2, 2026 at 07:27 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 02 Sep 2026 07:45:00 +0000

Type Values Removed Values Added
Title Unauthenticated Access to LAN Configuration via Incorrect Access Control

Wed, 02 Sep 2026 06:45:00 +0000

Type Values Removed Values Added
Title Unauthorized Access to LAN Configuration via POST on TOTOLINK T6
Weaknesses CWE-200

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

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 28 Aug 2026 22:45:00 +0000

Type Values Removed Values Added
First Time appeared Totolink
Totolink t6
Vendors & Products Totolink
Totolink t6

Fri, 28 Aug 2026 21:00:00 +0000

Type Values Removed Values Added
Title Unauthorized Access to LAN Configuration via POST on TOTOLINK T6
Weaknesses CWE-200
CWE-284

Fri, 28 Aug 2026 19:45:00 +0000

Type Values Removed Values Added
Description Incorrect access control in the getLanCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain LAN addressing and DHCP configuration information via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
References

Subscriptions

Totolink T6
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-01T16:15:01.959Z

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

Link: CVE-2026-51615

cve-icon Vulnrichment

Updated: 2026-09-01T16:13:01.165Z

cve-icon NVD

Status : Deferred

Published: 2026-08-28T20:18:04.647

Modified: 2026-09-01T17:17:25.827

Link: CVE-2026-51615

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-02T07:30:18Z

Weaknesses