CVE-2026-27874 in EasyIO FS32
Summary
by MITRE • 10/02/2026
: Use of Hard-coded Credentials vulnerability in Johnson Controls EasyIO FS32 allows : Exploitation of Default or Hard-coded Credentials.
This issue affects EasyIO FS32: before 3.0b63.
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Analysis
by VulDB Data Team • 10/02/2026
The identified security flaw within the Johnson Controls EasyIO FS32 firmware, specifically versions prior to 3.0b63, constitutes a critical vulnerability rooted in the improper handling of authentication mechanisms. This issue is classified under CWE-798: Use of Hard-coded Credentials, which describes scenarios where software contains fixed credentials that are not intended for end-users and cannot be changed by administrators or users. In this specific instance, the firmware ships with default or hard-coded login parameters embedded directly into the codebase rather than being dynamically generated or configurable during initial setup. This architectural decision fundamentally undermines the principle of least privilege and secure-by-design practices, as it creates a predictable entry point for malicious actors who are familiar with common vendor defaults or have access to reverse-engineered firmware images.
From an operational perspective, this vulnerability allows unauthorized entities to bypass authentication controls entirely if they can identify the hard-coded credentials embedded in the system. The exploitation of these default credentials enables attackers to gain administrative-level access to the EasyIO FS32 device without needing to perform complex password cracking or exploit other software bugs. Once authenticated, an attacker could potentially modify critical configuration settings, disrupt industrial operations by altering control logic, exfiltrate sensitive data stored on the device, or use the compromised unit as a pivot point for further lateral movement within the network infrastructure. The impact is particularly severe in Industrial Control Systems (ICS) and Building Automation environments where these devices are often deployed because they may manage physical processes such as HVAC systems, access control, or energy management, making unauthorized changes potentially dangerous to both digital security and physical safety.
This vulnerability aligns with MITRE ATT&CK technique T1078: Valid Accounts, specifically the sub-technique of using default accounts provided by a vendor. Attackers frequently automate searches for devices exposing such weak authentication vectors across internet-facing services or internal networks using tools like Shodan or Censys to identify vulnerable instances before launching targeted attacks. The persistence of hard-coded credentials suggests that during the development lifecycle, security testing did not adequately enforce policies requiring unique credential generation per device instance or secure storage mechanisms such as hardware-backed keystores. This oversight leaves the system susceptible to both opportunistic scanning campaigns and sophisticated threat actors who prioritize low-effort entry points for initial access.
To mitigate this risk, immediate remediation is required by upgrading the EasyIO FS32 firmware to version 3.0b63 or later, where Johnson Controls has presumably addressed the hard-coded credential issue through improved authentication workflows. If an upgrade is not immediately feasible due to operational constraints, organizations should implement network segmentation strategies to isolate these devices from untrusted networks and restrict access to only authorized management subnets using strict firewall rules. Additionally, implementing multi-factor authentication at the gateway or proxy level can provide a secondary layer of defense even if the device itself relies on weak internal credentials. Regular vulnerability scanning focused specifically on default credential checks should be integrated into routine security assessments for all IoT and ICS assets to ensure that such misconfigurations are detected early in their lifecycle.