CVE-2018-5400

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
50.9%
KEV
Not listed

Published

October 8, 2018

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Jul 20, 2026
No patch confirmed yet. Sources: cert.
generic

Auto-Maskin RP210E, DCU210E, and Marine Observer Pro (Android App) | CISA

https://www.us-cert.gov/ics/advisories/icsa-20-051-04
cert

VU#176301 - Auto-Maskin DCU 210E RP 210E and Marine Pro Observer App

https://www.kb.cert.org/vuls/id/176301

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:17 UTCEG score recompute
  2. 2026-07-22 14:05 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
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  41. 2026-06-08 14:14 UTCEPSS rescore
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  59. 2026-05-28 13:43 UTCEPSS rescore
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  61. 2026-05-28 02:24 UTCEG score recompute
  62. 2026-05-28 02:24 UTCGHSA enrichment
  63. 2026-05-27 13:38 UTCEPSS rescore
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  66. 2026-05-26 07:17 UTCEPSS rescore
  67. 2026-05-26 07:17 UTCEPSS rescore

Frequently asked(5)

What is CVE-2018-5400?
CVE-2018-5400 is a critical vulnerability published on October 8, 2018. 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…
When was CVE-2018-5400 disclosed?
CVE-2018-5400 was first published in the National Vulnerability Database on October 8, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-5400 actively exploited?
CVE-2018-5400 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 50.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-5400?
CVE-2018-5400 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2018-5400?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-5400, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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