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CVE-2018-5400

The Auto-Maskin DCU 210E, RP-210E, and Marine Pro Observer Android App utilize an undocumented custom protocol to set up Modbus communications with other devices without validating those devices, resulting in an origin validation error

CRITICAL
9.1
CVSS Score
Published: October 8, 2018 at 03:00 PM UTC
Updated: June 17, 2026 at 02:00 AM UTC
4 products affected across 1 vendorRp 210E FirmwareDcu 210E FirmwareRP-210E· also runs on 1 platform

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Severity
CRITICAL9.1
Exploit prediction
EPSS 0.7%

Description

The Auto-Maskin products utilize an undocumented custom protocol to set up Modbus communications with other devices without validating those devices. The originating device sends a message in plaintext, 48:65:6c:6c:6f:20:57:6f:72:6c:64, "Hello World" over UDP ports 44444-44446 to the broadcast address for the LAN. Without verification devices respond to any of these broadcast messages on the LAN with a plaintext reply over UDP containing the device model and firmware version. Following this exchange the devices allow Modbus transmissions between the two devices on the standard Modbus port 502 TCP. Impact: An attacker can exploit this vulnerability to send arbitrary messages to any DCU or RP device through spoofing or replay attacks as long as they have access to the network. Affected releases are Auto-Maskin DCU-210E RP-210E: Versions prior to 3.7 on ARMv7.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Dcu 210E Firmware· Auto Maskin
95%
All versions
arm-arm7 (environment) · auto-maskin-dcu-210e (same device)
Rp 210E Firmware· Auto Maskin
95%
All versions
arm-arm7 (environment) · auto-maskin-rp-210e (same device)
DCU-210E· Auto Maskin
60%
v < 3.7
Affected range stops below 3.7, so it looks safe — our inference, not a vendor statement
RP-210E· Auto Maskin
60%
v < 3.7
Affected range stops below 3.7, so it looks safe — our inference, not a vendor statement

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Third Party Advisoryx_refsource_CERT-VNUS Government Resource
Source: [email protected]
https://www.kb.cert.org/vuls/id/176301
x_refsource_MISC
Source: [email protected]
https://www.us-cert.gov/ics/advisories/icsa-20-051-04

CVSS

9.1CRITICALcertcc
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-346

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