CVE-2026-80151 in EMG7500
Summary
by MITRE • 09/22/2026
Lantronix SLC8000 before firmware v9.7.0.3, EMG8500/EMG7500 before firmware v9.7.0.1, and all firmware versions of SLB882/SLCx-03/SLCx-02 contain a command injection vulnerability that allows authenticated attackers with the services permission to execute arbitrary shell commands as root by exploiting the set nfs download command that passes unsanitized user input to a system() call. Attackers with the services permission can authenticate to the terminal or CLI interface and inject malicious commands through the unsanitized parameter to achieve complete loss of confidentiality, integrity, and availability on the affected device and potentially impact downstream serial-attached devices.
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Analysis
by VulDB Data Team • 09/22/2026
The vulnerability described constitutes a critical command injection flaw within Lantronix industrial networking hardware, specifically affecting the SLC8000 series prior to firmware version 9.7.0.3, the EMG8500 and EMG7500 models before firmware version 9.7.0.1, and all existing firmware versions of the SLB882, SLCx-03, and SLCx-02 devices. This security defect is rooted in improper input validation within the device management interface, where user-supplied data is directly concatenated into system commands without adequate sanitization or escaping mechanisms. The specific vector involves the set nfs download command, which accepts parameters from authenticated users possessing services permissions. When these parameters are processed by the underlying operating system via a system() call, they allow for the execution of arbitrary shell commands with root-level privileges. This represents a severe breakdown in input handling practices that is commonly categorized under CWE-78 Improper Neutralization of Special Elements used in an OS Command, highlighting the failure to distinguish between executable code and data within command strings.
From an operational perspective, the impact of this vulnerability extends far beyond simple unauthorized access. Because the injection occurs at a privilege level equivalent to root, attackers can achieve complete compromise of the affected device's confidentiality, integrity, and availability. An authenticated attacker with services permissions can manipulate network configurations, exfiltrate sensitive data stored on or routed through the device, install persistent backdoors, or disrupt critical industrial processes by altering operational parameters. The threat is particularly acute in Industrial Control Systems (ICS) and Operational Technology (OT) environments where these devices are frequently deployed as gateways between high-speed Ethernet networks and slower serial protocols such as RS-232 or RS-485. Consequently, the compromise of a Lantronix device can serve as a pivot point for lateral movement within an industrial network, potentially impacting downstream serial-attached PLCs, HMIs, and other critical infrastructure components that rely on these devices for connectivity.
The attack complexity is relatively low due to the requirement only for authentication with services permissions rather than full administrative access, which may be more readily obtainable through credential theft or misconfiguration in many industrial settings. This aligns with ATT&CK techniques such as T1059 Command and Scripting Interpreter, specifically shell command injection, and potentially T1486 Data Encrypted for Impact if the attacker uses the gained privileges to deploy ransomware or destructive malware against downstream systems. The ability to execute commands as root means that standard user-level restrictions are effectively bypassed, allowing the adversary to modify system binaries, alter firewall rules, or disable logging mechanisms to cover their tracks. This level of access facilitates both immediate exploitation for data theft and long-term persistence within the network architecture.
Mitigation strategies must prioritize immediate firmware updates where available. For SLC8000 devices, upgrading to version 9.7.0.3 or later is essential, while EMG8500 and EMG7500 units require version 9.7.0.1 or newer. Devices running SLB882, SLCx-03, or SLCx-02 firmware lack a patched release in the provided context, necessitating alternative compensating controls until vendor patches are issued. These controls should include strict network segmentation to isolate industrial control networks from untrusted zones such as corporate IT networks or the public internet. Access to the management interfaces of these devices must be restricted using role-based access control principles, ensuring that only essential personnel have services permissions and that strong, unique credentials are enforced. Additionally, implementing intrusion detection systems capable of identifying command injection patterns in network traffic can provide an additional layer of defense-in-depth for environments where immediate patching is not feasible due to operational constraints or legacy system dependencies.