Hitachi Energy MACH GWS
Plan Patch7.1ICS-CERT ICSA-25-289-11Oct 16, 2025
Summary
MACH GWS versions 3.0.0.0 through 3.4.0.0 contain three vulnerabilities: improper file permissions (CWE-276) allow unauthorized modification of system files, an unspecified issue (CWE-354) can cause denial of service, and missing certificate validation (CWE-295) enables man-in-the-middle attacks on network communications. These vulnerabilities affect the gateway's ability to securely manage process data and system integrity in energy infrastructure deployments.
What this means
What could happen
An attacker could modify system files, disrupt MACH GWS operations, or intercept network communications between the gateway and connected systems, potentially affecting grid management or process visibility.
Who's at risk
Energy sector operators managing grid operations, RTU communications, or process monitoring through MACH GWS gateways (versions 3.0.0.0 through 3.4.0.0) should prioritize this vulnerability. Impact applies to any deployment handling SCADA data, remote terminal unit coordination, or substation gateway functions.
How it could be exploited
An attacker with network access to MACH GWS can exploit improper file permissions to tamper with system configuration files, trigger resource exhaustion to cause denial of service, or position themselves on the network path to perform man-in-the-middle attacks on unencrypted or improperly validated communications.
Prerequisites
- Network access to MACH GWS management interface or services
- System deployed without network segmentation from untrusted networks
- No detection of outbound TLS/certificate validation enforcement
remotely exploitablelow complexityaffects energy infrastructurefile permission issues enable privilege escalationno encryption validation allows man-in-the-middle attacks
Exploitability
Low exploit probability (EPSS 0.1%)
Affected products (1)
ProductAffected VersionsFix Status
MACH GWS 3.0.0.0 to 3.4.0.0≥ 3.0.0.0, ≤ 3.4.0.03.5
Remediation & Mitigation
0/6
Do now
0/4HARDENINGImplement network segmentation: isolate MACH GWS on a separate VLAN with firewall rules allowing only essential management and data ports
HARDENINGReview and restrict file system permissions on MACH GWS to limit who can read or modify system files
HARDENINGImplement firewall rules to block direct internet access from MACH GWS and limit inbound connections to authorized management stations only
HARDENINGEnforce strong password policies for all MACH GWS user accounts and service accounts
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HOTFIXUpdate MACH GWS to version 3.5 or later
Long-term hardening
0/1HARDENINGScan portable media and removable storage for malware before connecting to MACH GWS or connected systems
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