EUVD-2026-68539
GHSA-7r6j-w75q-gfrc
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Remote, low-complexity, unauthenticated access to the CGI endpoint gives high integrity impact via policy tampering; confidentiality impact is at most low and availability is unaffected.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the setAccessDeviceCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to alter access-device policies via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Access-control bypass in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote unauthenticated attackers modify access-device policies by sending a crafted POST request to the setAccessDeviceCfg handler at /cgi-bin/cstecgi.cgi. Because no authentication is required (CVSS 9.1, AV:N/PR:N), an attacker on the network path can tamper with device access rules that govern which clients and controls apply to the LAN. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network access to the TOTOLINK T6 web management interface and the ability to send a POST request to the /cgi-bin/cstecgi.cgi endpoint invoking the setAccessDeviceCfg function; per the CVSS vector (AV:N/AC:L/PR:N/UI:N) no authentication, no user interaction, and no special configuration are needed against the affected firmware. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals point to a genuinely high-priority issue for exposed devices: the CVSS 3.1 base score is 9.1 with a fully remote, low-complexity, no-privilege, no-interaction vector, and the vulnerability class (unauthenticated config tampering) is directly actionable. … 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 patched firmware version is identified in the provided data, so a specific upgrade target cannot be cited; monitor the TOTOLINK download page for the T6 (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) and the vendor coordination trackers for a fixed build. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify all TOTOLINK T6 routers running firmware 4.1.5cu.748_B20211015 or earlier; implement firewall rules blocking access to /cgi-bin/cstecgi.cgi; reset default credentials on affected devices. …
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Same weakness CWE-284 – Improper Access Control
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External POC / Exploit Code
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