The Auto-Maskin DCU 210E firmware contains an undocumented Dropbear SSH server, v2015.55, configured to listen on Port 22 while the DCU is running and is configured with a hard-coded credentials

published 2018-10-08 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-17169

cvss: 9.4; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 2.1%; EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits: 0; none known

The Auto-Maskin DCU 210E firmware contains an undocumented Dropbear SSH server, v2015.55, configured to listen on Port 22 while the DCU is running. The Dropbear server is configured with a hard-coded user name and password combination of root / amroot. The server is configured to use password only authentication not cryptographic keys, however the firmware image contains an RSA host-key for the server. An attacker can exploit this vulnerability to gain root access to the Angstrom Linux operating system and modify any binaries or configuration files in the firmware. Affected releases are Auto-Maskin DCU-210E RP-210E: Versions prior to 3.7 on ARMv7.

Patch / fix

fixed in 2

auto-maskin dcu-210e_firmware 3.7
auto-maskin rp-210e_firmware 3.7

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-20-051-04 updated 2020-02-20 cvss 9.8

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

Auto-Maskin DCU210E <= 3.7 Auto-Maskin RP210E <= 3.7
affected: mitigation “Auto-Maskin reports new firmware is available to download from its website that mitigates the reported vulnerabilities.” auto-maskin.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

2.10% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.0	9.4	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
NVD	3.0	9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	10.0	AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

Auto-Maskin DCU-210E
Auto-Maskin RP-210E

Classification

Weakness

CWE-798 Use of Hard-coded Credentials

References

kb.cert.org /vuls/id/176301
third-party-advisory, us-government-resource
us-cert.gov /ics/advisories/icsa-20-051-04

Sources

CVE List CVE-2018-5399
NVD CVE-2018-5399

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary