CVE-2018-5399: 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

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-10-08 · updated 2026-06-17
Weakness: CWE-798

Description

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.

Affected products

Auto-Maskin Dcu-210E Firmware: before 3.7 — fixed in 3.7
Auto-Maskin Rp-210E Firmware: before 3.7 — fixed in 3.7

How to fix

Upgrade to a fixed version: Auto-Maskin Dcu-210E Firmware 3.7; Auto-Maskin Rp-210E Firmware 3.7. Check the vendor advisory for mitigations.

References

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