EUVD-2026-69207
GHSA-m6vp-fh75-wqjg
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated MQTT publish, but broker is a mesh/LAN control plane (AV:A) and effect is write-only heartbeat injection affecting mesh state integrity (I:L), with no read (C:N) or clear service loss (A:N).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the keepAlive function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to emit indirect mesh heartbeat information toward the master via sending a crafted MQTT message to the cs_broker component.
AnalysisAI
Unauthenticated mesh-heartbeat injection in the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets a remote attacker send a crafted MQTT message to the cs_broker component and cause the keepAlive function to emit indirect mesh heartbeat information toward the mesh master. The flaw is a missing access-control check (CWE-284) on an internal MQTT topic that trusts any client. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to reach the cs_broker MQTT endpoint and publish a crafted message that the keepAlive function processes; no authentication or user interaction is required (PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The input CVSS of 9.8 (AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:H) rates this as critical, but the impact metrics appear overstated relative to the described behavior. … 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; monitor the TOTOLINK download page (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) and the CVE-Vendor-Coordination trackers for a fixed build newer than 4.1.5cu.748_B20211015. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify and inventory all TOTOLINK T6 routers in your environment and their firmware versions; immediately apply firewall rules to restrict MQTT broker access (ports 1883, 8883) to trusted internal networks only. …
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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