EUVD-2026-68672
GHSA-44cj-pjqf-756c
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Unauthenticated single-request install of an attacker CGI module is full code execution, so C:H/I:H/A:H; I raise A from the input's N since arbitrary root code affects availability too.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the UploadCustomModule function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to install a custom CGI module via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Unauthenticated custom-CGI-module installation on the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote attackers plant attacker-controlled CGI code through the UploadCustomModule handler in /cgi-bin/cstecgi.cgi. Because the endpoint enforces no authentication or access control, a single crafted POST request installs an executable module - effectively arbitrary code execution on the device. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability of the device's web management endpoint /cgi-bin/cstecgi.cgi and the ability to send a POST invoking the UploadCustomModule function on TOTOLINK T6 firmware 4.1.5cu.748_B20211015 - no authentication, credentials, or user interaction are needed (PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, C:H/I:H) describes a trivially reachable, unauthenticated, low-complexity flaw - the worst end of the spectrum for reachability. … 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 vendor-released patch version is identified at time of analysis; the referenced TOTOLINK pages are the product/download portal, so monitor them and the vendor-coordination trackers (github.com/DarkBoulder/CVE-Vendor-Coordination and github.com/ShengWu00/CVE-Vendor-Coordination) for a fixed firmware build and upgrade as soon as one is published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify and inventory all TOTOLINK T6 routers across your network and immediately isolate affected devices to a separate management VLAN or take offline if possible. …
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today