CVE-2026-73172 in EKI-1242EIMS
Summary
by MITRE • 09/16/2026
Nozomi Networks Labs identified a CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in the edgserver management service of Advantech EKI-1242EIMS in firmware version V1.06.01 that allows a remote unauthenticated attacker to execute arbitrary OS commands as root via crafted requests to TCP port 5058.
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Analysis
by VulDB Data Team • 09/16/2026
The vulnerability identified by Nozomi Networks Labs represents a critical security flaw within the Advantech EKI-1242EIMS industrial Ethernet switch, specifically affecting its edgserver management service in firmware version V1.06.01. This issue is classified under CWE-78, which denotes Improper Neutralization of Special Elements used in an OS Command, commonly known as OS command injection. The core technical flaw lies in the application's failure to adequately sanitize or validate user-supplied input before incorporating it into system-level commands executed by the underlying operating system. Because this service is exposed via TCP port 5058 and does not require authentication for access, an attacker can interact with the management interface directly from a remote network position without needing valid credentials. This lack of access control combined with insufficient input validation creates a direct pathway for malicious actors to manipulate the command execution context.
From a technical perspective, the edgserver component likely processes specific parameters or headers within HTTP or proprietary protocol requests and passes them directly to shell interpreters such as /bin/sh or similar utilities without escaping special characters like semicolons, ampersands, or pipes. This allows an attacker to terminate the intended command string and append arbitrary operating system commands. Since the service typically runs with elevated privileges necessary for device management, these injected commands are executed with root-level permissions. This grants the attacker full control over the underlying Linux-based firmware of the industrial switch, enabling them to read sensitive configuration files, modify network settings, install backdoors, or pivot further into the connected operational technology environment.
The operational impact of this vulnerability is severe due to its placement within critical infrastructure components. Industrial Ethernet switches serve as the backbone for communication between supervisory control and data acquisition systems and field-level devices such as programmable logic controllers and remote terminal units. Compromise at this layer disrupts visibility into network traffic, allows for potential manipulation of industrial processes by altering routing tables or firewall rules embedded in the switch firmware, and facilitates lateral movement across the plant floor. An attacker leveraging this flaw can effectively blind security monitoring tools that rely on network telemetry from these switches while simultaneously gaining a persistent foothold with high-level privileges within the OT environment.
Mitigation strategies must address both immediate remediation and long-term architectural resilience. The primary defense is to apply the firmware update provided by Advantech that patches the input validation logic in the edgserver management service. Until such updates are available, network segmentation should be strictly enforced to ensure that TCP port 5058 is not accessible from untrusted networks or the internet. Access control lists on upstream routers and firewalls must restrict connectivity to this specific IP address and port only to authorized administrative workstations. Additionally, implementing deep packet inspection solutions capable of detecting command injection patterns in traffic destined for industrial devices can provide an additional layer of defense against exploitation attempts while patching efforts are underway.
This vulnerability aligns with MITRE ATT&CK techniques related to Command and Scripting Interpreter abuse, specifically the execution of operating system commands through injected payloads. It also reflects common pitfalls in embedded device development where convenience often overrides security rigor during initial design phases. The absence of authentication for a management interface that handles privileged operations is a significant deviation from industry best practices outlined in standards such as IEC 62443, which emphasizes the need for secure configuration and access control mechanisms in industrial automation and control systems. Addressing this issue requires not only patching but also reviewing other exposed services on similar devices to ensure they adhere to principles of least privilege and require robust authentication before allowing any form of system interaction.