EUVD-2026-68755
GHSA-j7w2-vm77-rw7v
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); deleting VLAN config tampers with configuration (I:H) and disrupts segmentation/connectivity (A:H) with no data disclosure (C:N).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the delVlanCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to remove VLAN entries via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
AnalysisAI
Improper access control in the delVlanCfg handler of the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets remote unauthenticated attackers delete VLAN configuration entries by POSTing to the /cgi-bin/cstecgi.cgi CGI endpoint. Removing VLAN entries collapses network segmentation, which can break isolation between trusted and guest/IoT segments and disrupt connectivity. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network access to the router's web management service and the ability to reach the /cgi-bin/cstecgi.cgi endpoint that dispatches the delVlanCfg function; 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 provided CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N, 9.1) reflects trivial network exploitability with no authentication or user interaction - a genuine concern for exposed management interfaces. … 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 identified at time of analysis; no fixed firmware version is cited in the references. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify and inventory all TOTOLINK T6 routers in production; confirm affected firmware version (4.1.5cu.748_B20211015 or earlier); implement firewall rules to block all external access to the device management interface, particularly POST requests to /cgi-bin/cstecgi.cgi. …
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Same weakness CWE-284 – Improper Access Control
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External POC / Exploit Code
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