EUVD-2026-69198
GHSA-wpv7-68x4-3w6h
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Network-reachable MQTT broker requires no authentication; impact is limited to LAN address state integrity with no confidentiality or availability consequence.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the updateLanIp function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to refresh the LAN address state via sending a crafted MQTT message to the cs_broker component.
AnalysisAI
Unauthenticated access control bypass in TOTOLINK T6 firmware 4.1.5cu.748_B20211015 exposes the updateLanIp function to arbitrary invocation by any attacker who can reach the router's MQTT broker. By publishing a crafted MQTT message to the cs_broker component, a remote unauthenticated attacker can force the device to refresh its LAN address state, enabling network disruption without any credentials. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must be able to reach the TOTOLINK T6's MQTT broker (cs_broker) over the network, which is typically available on the LAN interface. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N) positions this as medium severity with a constrained impact profile: no confidentiality or availability impact is claimed, and the integrity effect is limited to LAN address state manipulation. … 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 has been independently confirmed at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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