EUVD-2026-69200
GHSA-9qxh-35cv-gh5r
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated MQTT message with no access check (AV:N/AC:L/PR:N/UI:N); a firmware flash trigger is write/state-changing so C:N, with high integrity and availability impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the meshSlaveUpdate function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to start a firmware download or flash workflow on the slave device via sending a crafted MQTT message to the cs_broker component.
AnalysisAI
Unauthenticated firmware-workflow abuse in TOTOLINK T6 routers (firmware 4.1.5cu.748_B20211015) lets a remote attacker start a firmware download or flash operation on a mesh slave device by publishing a crafted MQTT message to the cs_broker component. The meshSlaveUpdate handler performs no authentication or access-control check on the inbound message, so any party able to reach the broker can trigger the slave update workflow. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the ability to send a crafted MQTT message to the cs_broker component of a TOTOLINK T6 running firmware 4.1.5cu.748_B20211015, targeting the meshSlaveUpdate handler; no credentials or user interaction are needed since the handler performs no access-control check. … 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:H = 9.8) treats this as trivially remote and unauthenticated. … 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, so track the TOTOLINK download portal (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) and apply an updated T6 firmware once published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all TOTOLINK T6 routers deployed in your environment and confirm their firmware versions, then contact the vendor regarding available security updates or patch timelines. …
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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