EUVD-2026-67290
GHSA-vcvc-jqq8-cgj4
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Passive interception of cleartext MQTT realistically requires a network-adjacent position (AV:A), needs no privileges or interaction, and enables credential theft, impersonation, and disruption (C/I/A:H).
Primary rating from Vendor (icscert).
CVSS VectorVendor: icscert
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
5DescriptionCVE.org
MQTT credentials and control traffic are transmitted in cleartext, exposing sensitive information to network-level attackers. This may enable unauthorized device impersonation and disruption of messaging functions.
AnalysisAI
Cleartext transmission of MQTT credentials and control traffic in Ebyte NE2-D11 firmware allows network-positioned attackers to intercept authentication material and message payloads, then impersonate devices and disrupt messaging. The flaw affects the NE2-D11 serial-to-Ethernet/MQTT gateway and was disclosed via CISA ICS advisory ICSA-26-237-06 (reported by ICS-CERT). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to be positioned to observe the device's MQTT traffic - the same Layer-2 segment, a mirrored/tapped link, or a man-in-the-middle position on the path to the broker - because the weakness is passive cleartext exposure of an unencrypted MQTT session (broker traffic, typically port 1883). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are mixed in a way worth stating plainly. … 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 specific vendor-released patched firmware version is identified in the provided data, so consult CISA advisory ICSA-26-237-06 (https://www.cisa.gov/news-events/ics-advisories/icsa-26-237-06) for Ebyte's current firmware update guidance and apply any released fixed version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Ebyte NE2-D11 devices in production, document their network locations and connected systems, and implement network segmentation to isolate affected gateways from untrusted network segments. …
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External POC / Exploit Code
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