Description
Incorrect access control in the getCloudSrvCheckStatus function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain cloud firmware check status 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: Information disclosure via unauthenticated access to cloud firmware status
Action: Assess Impact
AI Analysis

Impact

Incorrect access control in the getCloudSrvCheckStatus function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015 gives attackers an unauthenticated window to probe the /cgi-bin/cstecgi.cgi endpoint. Because the weakness maps to CWE‑284 (Improper Access Control), the attacker can obtain cloud firmware check status information that may include device identifiers, firmware revision, and other operational details. This leakage compromises confidentiality but does not grant execution privileges or further control over the device.

Affected Systems

TOTOLINK T6 routers running firmware version 4.1.5cu.748_B20211015 are affected. No other vendors or products appear to be impacted according to the available data.

Risk and Exploitability

The EPSS is less than 1%, indicating a low but non‑zero exploitation probability. The CVSS score of 7.5 classifies the vulnerability as High severity. The weakness is listed under CWE‑284 and is not featured in the CISA KEV catalog. Attackers can exploit the open /cgi‑bin/cstecgi.cgi endpoint via an unauthenticated POST request, revealing cloud firmware status information that could expose device identifiers, firmware revisions, or other operational data. Although it does not allow code execution or direct device control, the confidentiality breach may aid further reconnaissance or targeted attacks. Monitoring and timely patching are recommended to mitigate the threat.

Generated by OpenCVE AI on September 2, 2026 at 00:46 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply TOTOLINK firmware updates that fix the improper access‑control flaw as soon as they are released.
  • Restrict outbound or inbound traffic to the /cgi-bin/cstecgi.cgi endpoint using firewall rules or ACLs, limiting access to approved internal networks.
  • If cloud firmware check is not required for your deployment, disable the feature through the router’s configuration menu.
  • Continuously monitor device logs for anomalous POST requests to /cgi-bin/cstecgi.cgi and set up alerts for suspicious activity.

Generated by OpenCVE AI on September 2, 2026 at 00:46 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 02 Sep 2026 08:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

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

Type Values Removed Values Added
Weaknesses CWE-284
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'}

Sat, 29 Aug 2026 00:45:00 +0000

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

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

Type Values Removed Values Added
Description Incorrect access control in the getCloudSrvCheckStatus function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain cloud firmware check status 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: 2026-09-01T17:56:33.256Z

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

Link: CVE-2026-51662

cve-icon Vulnrichment

Updated: 2026-09-01T17:56:29.039Z

cve-icon NVD

Status : Deferred

Published: 2026-08-28T22:16:49.413

Modified: 2026-09-01T18:17:42.210

Link: CVE-2026-51662

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-02T01:00:07Z

Weaknesses