CVE-2026-71451 in EasyIO FS32
Summary
by MITRE • 10/02/2026
- OS Command Injection vulnerability in Johnson Controls EasyIO FS32 allows - Command Injection.
This issue affects EasyIO FS32: before 3.0b63.
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Analysis
by VulDB Data Team • 10/02/2026
The identified security flaw represents a critical OS command injection vulnerability within the Johnson Controls EasyIO FS32 system, specifically affecting versions prior to release 3.0b63. This type of vulnerability arises when an application constructs operating system commands using input data that has not been adequately sanitized or validated by the developer. In this context, the EasyIO FS32 device fails to properly neutralize special elements within user-supplied input before incorporating it into a command used for OS-level operations. The root cause lies in insufficient validation mechanisms where external inputs are directly concatenated with static code strings without employing allow-lists, strict type checking, or proper escaping of metacharacters such as semicolons, pipes, and ampersands that serve as command separators in shell environments.
From a technical perspective, this flaw allows an attacker to inject arbitrary operating system commands into the application's execution flow. By crafting malicious input strings containing these special characters, an adversary can terminate the intended command and append new ones for immediate execution by the underlying operating system. This bypasses any intended logic controls within the EasyIO FS32 software, effectively granting the attacker a mechanism to execute code with the privileges of the process running the vulnerable application. The severity is compounded if this service runs with elevated permissions or root access, which is common in industrial control systems and building automation devices where administrative tasks require high-level system rights.
The operational impact of this vulnerability is severe, potentially leading to complete compromise of the affected device and any connected network segments. An attacker could exploit this flaw to read sensitive configuration files, modify system settings, install backdoors, or pivot further into the internal corporate network. In an industrial environment, such as a building automation setup managed by EasyIO FS32, successful exploitation could disrupt critical infrastructure services, cause physical damage through unauthorized control of HVAC systems or security barriers, and lead to significant downtime and financial loss. The lack of input validation means that even unauthenticated attackers with network access to the device interface can potentially achieve remote code execution without needing valid credentials for higher-level administrative functions.
This vulnerability aligns closely with CWE-78 Improper Neutralization of Special Elements used in an OS Command, commonly known as OS Command Injection. It also maps to MITRE ATT&CK techniques related to Execution and Persistence, specifically T1059 Command and Scripting Interpreter, where adversaries use system utilities like sh or cmd.exe to execute malicious commands. The exploitation vector typically involves network-based interaction with the device's management interface or API endpoints that accept user input for configuration or status queries.
To mitigate this risk, organizations must immediately apply the vendor-recommended software update to version 3.0b63 or later, which addresses the underlying code flaws responsible for improper input handling. Until patching is feasible, network segmentation strategies should be employed to restrict access to the EasyIO FS32 management interfaces from untrusted networks. Input validation controls can also serve as a temporary defense-in-depth measure by implementing strict allow-lists on all user-facing inputs and rejecting any data containing shell metacharacters or unexpected character sets. Regular vulnerability assessments and penetration testing should be conducted to identify similar injection points in other connected industrial control system components, ensuring comprehensive protection against command injection attacks across the operational technology environment.