EUVD-2026-69377
GHSA-p69c-22hx-vq62
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network MQTT message forces reboot (A:H) and clears pairing state (I:L); no data disclosure so C:N, contradicting the vendor's C:H.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the recvClearPairCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to reset pairing state and reboot the device via sending a crafted MQTT message to the cs_broker component.
AnalysisAI
Unauthenticated device reboot and pairing-state reset affects the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) via its recvClearPairCfg handler, which processes MQTT messages to the cs_broker component without verifying the sender's authorization. A remote attacker who can reach the MQTT broker can send a crafted message to wipe the device's pairing state and force a reboot, disrupting connectivity. …
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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 to the recvClearPairCfg handler; no credentials, user interaction, or non-default configuration is described (PR:N/UI:N/AC:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor/NVD CVSS of 9.8 (AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:H) overstates real-world impact: the described behavior is resetting pairing state and rebooting the device, which is fundamentally an availability event with a limited integrity component - there is no described data disclosure, so C:H is not supported by the description. … 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 provided data at time of analysis; monitor the TOTOLINK download portal (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) and the vendor-coordination trackers for a fixed build superseding 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 in your environment, particularly those on firmware version 4.1.5cu.748_B20211015; immediately restrict network access to MQTT broker ports (typically 1883 for unencrypted, 8883 for encrypted) to only authorized systems and implement firewall rules to block external MQTT connectivity. …
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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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