EUVD-2026-69195
GHSA-vvrr-mhfc-r8h5
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Internal cs_broker is typically LAN/mesh-reachable (AV:A); unauthenticated write to tracking files gives I:H with no confidentiality read (C:N) and only limited availability disruption (A:L).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the recvSlaveCloudCheckStatus function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to overwrite cloud-result tracking files via sending a crafted MQTT message to the cs_broker component.
AnalysisAI
Incorrect access control in the recvSlaveCloudCheckStatus function of the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) lets unauthenticated attackers overwrite cloud-result tracking files by publishing a crafted MQTT message to the internal cs_broker component. Because the broker accepts and acts on these messages without authenticating the sender, any actor able to reach the MQTT service can corrupt the router's cloud-check state. …
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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 internal MQTT broker (cs_broker) and the ability to publish a crafted MQTT message to the recvSlaveCloudCheckStatus topic/handler; no credentials are needed (PR:N) and no user interaction is required. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The supplied CVSS is 9.8 (AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:H), but that appears overstated for the described behavior: the function overwrites cloud-result tracking files, which is a write/integrity action with no described confidentiality read and no confirmed code execution, so C:H (and likely A:H) is not well supported - a vector closer to integrity-only is more defensible. … 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 in the available data, so no fixed firmware build can be cited; check the TOTOLINK download page (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for an updated T6 firmware and apply it once released. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit your infrastructure to identify all TOTOLINK T6 routers and confirm firmware versions affected (particularly 4.1.5cu.748_B20211015). …
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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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