CVE-2026-73163: Advantech EKI-1242IEIMS RCE Vulnerability

CVE-2026-73163 Overview

CVE-2026-73163 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. The flaw allows a remote authenticated attacker to execute arbitrary operating system commands as root by supplying crafted request parameters. Nozomi Networks Labs identified and reported the issue to Advantech.

Critical Impact
Authenticated attackers reaching the device web interface can gain full root-level control of the gateway, enabling lateral movement into operational technology (OT) networks and disruption of industrial protocol traffic.

Affected Products

Advantech EKI-1242IEIMS industrial protocol gateway
Firmware version V1.06.01
Deployments exposing the web management interface to reachable networks

Discovery Timeline

2026-09-16 - CVE-2026-73163 published to the National Vulnerability Database (NVD)
2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-73163

Vulnerability Analysis

The vulnerability resides in the web management interface of the EKI-1242IEIMS gateway. The interface accepts request parameters that are subsequently passed to an underlying operating system shell without sufficient neutralization of shell metacharacters. An authenticated attacker who can reach the management interface over the network can inject additional commands into these parameters. The injected commands execute in the context of the root account, granting complete control over the device.

Because the EKI-1242IEIMS bridges serial industrial protocols to Ethernet, compromise of the gateway provides an attacker with an interception and manipulation point for OT traffic. The device typically sits between programmable logic controllers (PLCs), remote terminal units (RTUs), and supervisory systems.

Root Cause

The root cause is improper neutralization of special elements used in an OS command, tracked under [CWE-78]. Request parameters delivered to the web interface are concatenated into shell command strings without escaping, quoting, or an allow-list of accepted values. Shell metacharacters such as ;, |, &, and backticks pass through unchanged, enabling command chaining.

Attack Vector

Exploitation requires network access to the web management interface and valid authentication with high privileges. Once authenticated, the attacker submits a crafted HTTP request containing shell metacharacters in a vulnerable parameter. The device executes the attacker-controlled command as root, returning the result through the normal web response or through any out-of-band channel the attacker prepares. No user interaction is required beyond the attacker's own session.

A verified public proof-of-concept is not available. Technical details are described in the Nozomi Networks CVE-2026-73163 Advisory and the Advantech Security Advisory EKI-1242IEIMS.

Detection Methods for CVE-2026-73163

Indicators of Compromise

HTTP requests to the EKI-1242IEIMS management interface containing shell metacharacters such as ;, |, &&, $(, or backticks in parameter values.
Unexpected outbound connections from the gateway to attacker-controlled infrastructure following administrative sessions.
New processes, cron entries, or modified startup scripts on the device that do not match a baseline firmware image.

Detection Strategies

Inspect web server and application logs on the gateway for administrative requests that contain unusual characters or unexpectedly long parameter values.
Baseline normal management traffic to the device and alert on deviations in request structure, source address, or session frequency.
Correlate authentication events on the device with subsequent configuration or process changes to identify abuse of legitimate credentials.

Monitoring Recommendations

Forward device syslog and web interface logs to a centralized SIEM for long-term retention and cross-source correlation.
Monitor OT network segments for anomalous traffic patterns originating from the gateway, including scans, protocol probes, or connections to unfamiliar hosts.
Track firmware version and configuration drift across the EKI-1242IEIMS fleet to detect unauthorized modifications.

How to Mitigate CVE-2026-73163

Immediate Actions Required

Restrict network access to the EKI-1242IEIMS web management interface to a dedicated management VLAN and a limited set of administrator workstations.
Rotate all administrative credentials on affected devices and enforce strong, unique passwords.
Review recent administrative activity on the device for signs of exploitation, including unexpected commands or configuration changes.

Patch Information

Refer to the Advantech Security Advisory EKI-1242IEIMS for vendor-supplied firmware updates and remediation guidance for firmware version V1.06.01. Apply the vendor-recommended firmware after validating it in a maintenance window.

Workarounds

Place the gateway behind a firewall that blocks all inbound access to the web management interface except from trusted jump hosts.
Disable the web management interface entirely when not in active use, relying on out-of-band or console access for administration.
Segment the device into a dedicated OT zone and apply strict east-west access controls to limit blast radius if the device is compromised.

bash

# Example: restrict management interface access with iptables on an upstream Linux gateway
iptables -A FORWARD -p tcp -s 10.10.20.0/24 -d 192.0.2.50 --dport 80  -j ACCEPT
iptables -A FORWARD -p tcp -s 10.10.20.0/24 -d 192.0.2.50 --dport 443 -j ACCEPT
iptables -A FORWARD -p tcp -d 192.0.2.50 --dport 80  -j DROP
iptables -A FORWARD -p tcp -d 192.0.2.50 --dport 443 -j DROP