OTPulse

Hitachi Energy e-mesh EMS

Act NowCVSS 8.1ICS-CERT ICSA-26-188-03Jun 30, 2026
Hitachi EnergyEnergy
Attack path
Attack VectorNetwork
Auth RequiredNone
ComplexityHigh
User InteractionNone needed
Summary

A buffer overflow vulnerability in Hitachi Energy e-mesh EMS versions 4.1.6, 4.4.2, and 4.7.0 allows remote exploitation through the NGINX web server component. The vulnerability could result in application outages (denial of service) or arbitrary code execution. Exploitation requires network access to the application and is more likely on systems without ASLR enabled or with rewrite configurations using "?" for unnamed captures.

What this means
What could happen
A buffer overflow in e-mesh EMS could allow an attacker to crash the application, disrupting energy management operations, or execute arbitrary code to alter system configuration and control logic.
Who's at risk
Energy utilities running Hitachi Energy e-mesh EMS for power management, grid operations, or energy control systems. Affected versions are 4.1.6, 4.4.2, and 4.7.0. The vulnerability impacts the core web application used to manage energy distribution and monitoring.
How it could be exploited
An attacker with network access to the e-mesh EMS application could send a specially crafted request to trigger a buffer overflow in the NGINX web server component. Successful exploitation could result in denial of service or remote code execution depending on system protections.
Prerequisites
  • <parameter name="item">Network access to e-mesh EMS application port
<parameter name="item">remotely exploitable
Exploitability
Likely to be exploited — EPSS score 68.0%
Public Proof-of-Concept (PoC) on GitHub (10 repositories)
Affected products (3)
3 with fix
ProductAffected VersionsFix Status
e-mesh EMS4.1.6Fix available
e-mesh EMS4.4.2Fix available
e-mesh EMS4.7.0Fix available
Remediation & Mitigation

Apply hotfix for respective e-mesh EMS versions to update NGINX to either v1.30.2 or latest Ensure rewrite configuration does not contain "?" to replace unnamed captures, and ensure ASLR is set to active (value=2) across all deployment targets covering all 3 versions. Underlying Ubuntu Server 20.04 LTS is End of Life. For e-mesh EMS versions 4.1.6/4.4.2 using Ubuntu 20.04 LTS, upgrade to Ubuntu Server 22.04, or 24.04, or activate Ubuntu Pro/ESM as an interim measure.

View full CISA ICS-CERT advisory
API: /api/v1/advisories/e51f306c-e209-4a08-ac98-63de9f1e617f

Get OT security insights every Tuesday

Advisory breakdowns, a weekly summary, and incident analyses for the people actually defending OT environments. Free, no account required.