EUVD-2026-68543
GHSA-qrmm-v4pr-7cm8
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Unauthenticated remote POST (AV:N/AC:L/PR:N/UI:N) but documented impact is only LED config change, so no confidentiality and only low integrity impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the setLedCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to modify LED behavior via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Improper access control in the setLedCfg handler of the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote unauthenticated attackers change the device's LED configuration by POSTing to the /cgi-bin/cstecgi.cgi endpoint. The flaw exposes a privileged configuration function without any authentication check, though its documented real-world impact is limited to altering LED behavior. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the TOTOLINK T6's HTTP management service and the ability to send a crafted POST request to the /cgi-bin/cstecgi.cgi endpoint invoking the setLedCfg function; per CVSS PR:N/UI:N no authentication or user interaction is needed against the affected 4.1.5cu.748_B20211015 build. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals conflict sharply and should be reconciled before prioritization. … 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 available data, so no exact fix version can be cited; check the TOTOLINK T6 download page (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for a firmware update addressing setLedCfg access control. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all TOTOLINK T6 routers currently deployed, confirm firmware versions, and apply network-level access controls restricting external access to the /cgi-bin/cstecgi.cgi endpoint. …
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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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