EUVD-2026-68678
GHSA-w7f8-gvq4-6rfg
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Unauthenticated network POST with no interaction (AV:N/AC:L/PR:N/UI:N); changing operating mode is an integrity action that also disrupts service (I:H/A:H), with no inherent data disclosure (C:N).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the setOpModeCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to change the device operating mode via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Operating-mode tampering in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote unauthenticated attackers alter the device's operating mode by POSTing to the /cgi-bin/cstecgi.cgi endpoint, because the setOpModeCfg handler performs no access-control check. An attacker on the network path can reconfigure how the router operates (e.g. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the router's HTTP management service and the ability to send a POST request to the /cgi-bin/cstecgi.cgi endpoint invoking the setOpModeCfg function - no authentication, credentials, or user interaction are needed against the affected firmware (4.1.5cu.748_B20211015). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are mixed. … 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 at time of analysis; the referenced links point to the general TOTOLINK site, a download page, and third-party coordination READMEs rather than a specific fixed build, so administrators should check the TOTOLINK download portal (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for a firmware release superseding 4.1.5cu.748_B20211015 and apply it once published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all TOTOLINK T6 devices and identify those running firmware 4.1.5cu.748_B20211015 or earlier; isolate affected units from production network paths. …
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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