EUVD-2026-69196
GHSA-rmr2-xr58-8gf9
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated crafted MQTT message (AV:N/AC:L/PR:N/UI:N) but effect is only temporary, reconnect-recoverable client disconnection, so C:N/I:N/A:L, not C:H/I:H/A:H.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the freeStaClient function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to forcibly disconnect wireless clients via sending a crafted MQTT message to the cs_broker component.
AnalysisAI
Unauthenticated wireless client disconnection affects the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015), where the freeStaClient handler in the cs_broker MQTT component performs no authentication or access control on incoming messages. Any attacker able to reach the internal MQTT broker can forcibly deauthenticate/disconnect connected Wi-Fi clients (CWE-284). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires network reachability to the TOTOLINK T6's cs_broker MQTT component and the ability to publish a crafted MQTT message invoking the freeStaClient handler; no authentication or user interaction is needed against firmware 4.1.5cu.748_B20211015. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals conflict. … 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; consult the TOTOLINK download portal (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for updated T6 firmware and apply any release postdating 4.1.5cu.748_B20211015. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and document all TOTOLINK T6 routers deployed in your environment and confirm firmware version (4.1.5cu.748_B20211015 and earlier are affected). …
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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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