EUVD-2026-69210
GHSA-236r-x7h9-mjjg
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Unauthenticated low-complexity MQTT injection, but impact is only disabling the guest AP - a config-state change (I:L) and loss of the guest service (A:L), with no confidentiality impact.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Incorrect access control in the guest_wifi_sync function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to disable guest virtual AP interfaces via sending a crafted MQTT message to the cs_broker component.
AnalysisAI
Unauthenticated denial of the guest Wi-Fi service on the TOTOLINK T6 router (firmware 4.1.5cu.748_B20211015) is possible because the guest_wifi_sync function performs no access control on messages arriving at the internal cs_broker MQTT component. Any attacker able to reach the broker can publish a crafted MQTT message to tear down the guest virtual AP interfaces, disrupting guest connectivity without credentials. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the cs_broker MQTT component and the ability to publish a crafted MQTT message that the guest_wifi_sync function processes; no credentials or user interaction are needed (PR:N/UI:N/AC:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The supplied CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N, base 9.1) rates this Critical, but the metric choices conflict with the described impact: disabling a guest AP interface is a loss of service (availability) and a configuration-state change (integrity), not a confidentiality breach - so C:H is not supportable, and A:N is contradictory given the outcome is that guest Wi-Fi stops working. … 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 was identified at time of analysis; monitor TOTOLINK (https://www.totolink.net/) and the coordination READMEs (DarkBoulder/ShengWu00 CVE-Vendor-Coordination) for a firmware update superseding 4.1.5cu.748_B20211015 and apply it once published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all TOTOLINK T6 routers on managed network segments and confirm which devices run firmware 4.1.5cu.748_B20211015, then assess whether guest WiFi is operationally critical. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
View allShare
External POC / Exploit Code
Leaving vuln.today