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Yokogawa STARDOM

Monitor6.3ICS-CERT ICSA-22-174-01Jun 23, 2022
Attack VectorAdjacent
Auth RequiredHigh
ComplexityHigh
User InteractionRequired
Summary

Yokogawa STARDOM FCN/FCJ controllers (firmware R1.01 through R4.31) contain vulnerabilities related to unencrypted data transmission (CWE-319) and hardcoded credentials (CWE-798). These allow attackers to intercept configuration data and credentials, then modify device settings or firmware. No public exploits currently exist, and the attack requires high privileges, network access to the device, and manual user interaction, making exploitation complex. Yokogawa has not released a patch and recommends network-level mitigations instead.

What this means
What could happen
An attacker with network access to a Yokogawa STARDOM FCN/FCJ controller could alter device configuration settings or modify device firmware, potentially disrupting process control or causing unsafe equipment operations.
Who's at risk
Water utilities and municipal electric providers operating Yokogawa STARDOM FCN/FCJ controllers (firmware versions R1.01 through R4.31) for process automation, data collection, and equipment monitoring are affected. Engineering teams responsible for setting device configurations are the primary targets.
How it could be exploited
An attacker on the same network segment as the STARDOM controller could capture unencrypted network traffic to intercept credentials or configuration data, then send crafted requests to alter device settings or firmware. The attack requires high privileges and manual interaction, which limits real-world exploitation likelihood.
Prerequisites
  • Network access to the STARDOM FCN/FCJ controller (same network segment or direct connection)
  • High-level privileges on the device or engineering workstation
  • Ability to capture or intercept network traffic (unencrypted channel vulnerability)
  • Manual user interaction to complete the attack
No patch available from vendorRemotely exploitable from network segmentHigh attack complexity limits real-world riskLow EPSS score (0.7%) indicates minimal current exploit activityUnencrypted credential and configuration data transmission
Exploitability
Low exploit probability (EPSS 0.7%)
Affected products (2)
2 EOL
ProductAffected VersionsFix Status
STARDOM FCN/FCJ:≥ R1.01 | ≤ R4.31No fix (EOL)
STARDOM FCN/FCJ:≥ R1.01 | ≤ R4.31 (Only affected by CVE-222-30997)No fix (EOL)
Remediation & Mitigation
0/6
Do now
0/1
WORKAROUNDEnable packet filtering on the STARDOM FCN/FCJ controller to restrict connections to only trusted hosts (engineering workstations, monitoring systems)
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXContact Yokogawa to discuss upgrade or remediation options for individual systems, as no public patch is currently available
Mitigations - no patch available
0/4
The following products have reached End of Life with no planned fix: STARDOM FCN/FCJ:, STARDOM FCN/FCJ:. Apply the following compensating controls:
HARDENINGImplement network segmentation to isolate STARDOM controllers from the business network and the Internet
HARDENINGEncrypt network traffic to the STARDOM controller to prevent credential and configuration interception
HARDENINGDeploy a firewall between control system networks and other networks to block unauthorized access
HARDENINGEstablish anti-virus, backup/recovery, network hardening, and whitelisting policies as part of an operational security program
View full CISA ICS-CERT advisory
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