EUVD-2026-67918
GHSA-3frq-mj5j-mg9f
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Network-reachable CGI endpoint requires no authentication; C:H reflects potential ISP credential exposure, with no integrity or availability impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the getWanInfo function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain WAN information returned by the endpoint via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Unauthenticated WAN configuration disclosure in TOTOLINK T6 firmware 4.1.5cu.748_B20211015 allows any attacker with network access to the router management interface to retrieve WAN interface data - potentially including ISP credentials - by sending a single crafted POST request to /cgi-bin/cstecgi.cgi without any authentication. This is part of a documented pattern of missing access control enforcement across multiple CGI endpoint functions in this firmware version, with coordinated disclosure references confirming the finding. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No authentication, no special configuration, and no user interaction are required - the getWanInfo endpoint responds to any unauthenticated POST request received on a network interface where the management CGI is reachable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 (High) vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N accurately reflects a low-complexity, unauthenticated, network-reachable information disclosure. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No patched firmware version is identified in the available data - the vendor advisory page at https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html should be monitored for updated firmware releases. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct inventory to identify all TOTOLINK T6 devices running firmware 4.1.5cu.748_B20211015 and determine whether the management interface (TCP port 443) is accessible from untrusted networks, particularly the internet. …
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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