EUVD-2026-69193
GHSA-f283-c9rp-m33q
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
MQTT cs_broker is network-accessible with no authentication enforced on setDevReboot; purely availability impact via forced reboot, no confidentiality or integrity effect.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
Incorrect access control in the setDevReboot function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to reboot the local device and, on a master, fan out reboot commands to mesh slaves via sending a crafted MQTT message to the cs_broker component.
AnalysisAI
Forced-reboot denial-of-service in TOTOLINK T6 firmware 4.1.5cu.748_B20211015 enables unauthenticated network attackers to instantly restart the device by sending a crafted MQTT message to the cs_broker component's setDevReboot handler, which performs no access control check. In mesh deployments, exploiting a master node propagates the reboot command to all registered slave nodes, taking down the entire mesh network in a single unauthenticated request. …
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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 MQTT cs_broker component - no credentials, special configuration, or user interaction are needed (CVSS PR:N, AC:L, UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, score 7.5) accurately reflects the threat profile: network-accessible, unauthenticated, zero-complexity exploitation producing high availability impact. … 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 | Consult the TOTOLINK firmware download page (https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html) for an updated firmware release that enforces authentication on the setDevReboot MQTT handler; no specific patched firmware version is confirmed in the available references. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit inventory to identify all TOTOLINK T6 deployments and assess whether any are mesh-configured; immediately implement network segmentation to restrict MQTT broker access to trusted internal sources only and enable firewall rules to block MQTT (ports 1883, 8883) from external/untrusted networks. …
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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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