CVE-2026-73164: Advantech EKI-1242IEIMS RCE Vulnerability

CVE-2026-73164 Overview

CVE-2026-73164 is an OS command injection vulnerability [CWE-78] in the web management interface of the Advantech EKI-1242IEIMS industrial protocol gateway running firmware version V1.06.01. Nozomi Networks Labs identified the flaw, which allows a remote authenticated attacker to execute arbitrary operating system commands as root through crafted request parameters. The device is an industrial Modbus-to-Ethernet/IP gateway commonly deployed in operational technology (OT) environments, so successful exploitation grants complete control of a critical network edge component.

Critical Impact
Authenticated attackers can execute arbitrary commands as root on the gateway, resulting in full compromise of the device and pivot opportunities into connected OT networks.

Affected Products

Advantech EKI-1242IEIMS industrial protocol gateway
Firmware version V1.06.01
Web management interface component

Discovery Timeline

2026-09-16 - CVE-2026-73164 published to NVD
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-73164

Vulnerability Analysis

The vulnerability resides in the web management interface of the Advantech EKI-1242IEIMS. The interface accepts request parameters that are passed into an operating system command context without adequate neutralization of shell metacharacters. An authenticated attacker can inject shell operators such as ;, |, or backticks into these parameters, causing the underlying operating system shell to interpret the payload as additional commands. Because the web service on this class of embedded device typically runs with elevated privileges, injected commands execute as root.

Successful exploitation compromises the confidentiality, integrity, and availability of the gateway. Attackers can read or modify device configuration, disable protocol translation, tamper with Modbus traffic, or install persistent implants. The gateway sits between IT and OT segments, so a compromised device can serve as a staging point for lateral movement into industrial control systems.

Root Cause

The root cause is improper neutralization of special elements used in an OS command [CWE-78]. Input taken from HTTP request parameters is concatenated into a shell command string and passed to a system-level execution function rather than being validated against an allowlist or passed as argument arrays to a safe execution API.

Attack Vector

Exploitation requires network access to the web management interface and valid administrative credentials, as reflected by the high privileges required in the CVSS vector. No user interaction is required. An attacker who has obtained credentials through phishing, credential reuse, or default-password abuse can send a crafted HTTP request that injects shell commands into a vulnerable parameter, achieving code execution as root.

No public proof-of-concept exploit is available at the time of publication. Refer to the Nozomi Networks CVE-2026-73164 Advisory for additional technical details.

Detection Methods for CVE-2026-73164

Indicators of Compromise

HTTP requests to the EKI-1242IEIMS web management interface containing shell metacharacters such as ;, &&, |, $(), or backticks in parameter values
Unexpected outbound network connections originating from the gateway to attacker-controlled infrastructure
New or modified files, cron entries, or startup scripts on the device following administrative sessions
Configuration changes to protocol translation or firewall rules that were not initiated by authorized operators

Detection Strategies

Inspect web traffic to the gateway management interface using a network intrusion detection system tuned for OS command injection patterns
Correlate authentication events on the gateway with subsequent anomalous protocol translation behavior or configuration modifications
Baseline outbound connections from the EKI-1242IEIMS and alert on deviations, since these devices should communicate with a limited set of endpoints

Monitoring Recommendations

Forward gateway syslog and authentication events to a centralized SIEM or data lake for retention and correlation
Deploy passive OT network monitoring to detect anomalous commands or unexpected traffic patterns on Modbus and Ethernet/IP segments served by the gateway
Alert on any successful authentication to the web management interface from unexpected source addresses or outside maintenance windows

How to Mitigate CVE-2026-73164

Immediate Actions Required

Restrict network access to the EKI-1242IEIMS web management interface to a dedicated management VLAN or jump host
Rotate administrative credentials on all affected gateways and enforce strong, unique passwords
Review recent administrative activity and configuration changes for signs of exploitation
Apply firmware updates published by the vendor as soon as they are available for the deployed hardware revision

Patch Information

Advantech has published a security advisory covering the EKI-1242IEIMS. Consult the Advantech Security Advisory EKI-1242IEIMS for the fixed firmware version and upgrade instructions. Verify the running firmware version on each device and schedule updates through the plant maintenance change control process.

Workarounds

Place the gateway behind a firewall that only permits management traffic from an authorized administrative subnet
Disable the web management interface when not actively required, or bind it to an internal management interface only
Enforce multifactor authentication on any jump hosts used to reach the device to reduce the risk of credential compromise
Segment OT networks so that a compromised gateway cannot reach unrelated control system assets

bash

# Example ACL restricting access to the gateway management interface
# Replace 10.10.20.0/24 with your authorized management subnet
# and 192.0.2.10 with the gateway address
access-list MGMT_ONLY permit tcp 10.10.20.0/24 host 192.0.2.10 eq 443
access-list MGMT_ONLY permit tcp 10.10.20.0/24 host 192.0.2.10 eq 80
access-list MGMT_ONLY deny   tcp any host 192.0.2.10 eq 443
access-list MGMT_ONLY deny   tcp any host 192.0.2.10 eq 80