EUVD-2026-69204
GHSA-6crr-f4rp-973c
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated single MQTT message (AV:N/AC:L/PR:N/UI:N); operation removes mesh data and reboots (I:H/A:H) but reads no secrets, so C:N rather than the vendor's C:H.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the delSlaveDevice function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to remove a specified slave device from local mesh management data and reboot the system via sending a crafted MQTT message to the cs_broker component.
AnalysisAI
Unauthenticated device removal and forced reboot affects the TOTOLINK T6 mesh router (firmware 4.1.5cu.748_B20211015), where the delSlaveDevice function in the cs_broker MQTT component accepts crafted messages without authentication. A remote attacker can delete a chosen slave device from the router's local mesh management data and trigger a system reboot, disrupting the mesh network. …
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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 cs_broker MQTT component and the ability to publish a crafted MQTT message invoking delSlaveDevice - no credentials, no user interaction, no non-default configuration is needed for the vulnerable code path itself. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The supplied CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H = 9.8) marks this critical, but the confidentiality claim (C:H) is not supported by the description: delSlaveDevice removes a device and reboots - it alters state and denies service, it does not read secrets. … 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; check the TOTOLINK T6 download page (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for firmware newer than 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: Audit your environment for TOTOLINK T6 routers and identify firmware version 4.1.5cu.748_B20211015 installations; document their network role and criticality. …
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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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