CVE-2026-71449 in EasyIO FS32
Summary
by MITRE • 10/02/2026
: Use of Hard-coded Cryptographic Key vulnerability in Johnson Controls EasyIO FS32 allows : Retrieve Embedded Sensitive Data.
This issue affects EasyIO FS32: before 3.0b63.
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Analysis
by VulDB Data Team • 10/02/2026
The identified vulnerability represents a critical failure in cryptographic key management within the Johnson Controls EasyIO FS32 firmware, specifically affecting versions prior to 3.0b63. This flaw is classified under CWE-798 as Use of Hard-coded Cryptographic Key, indicating that sensitive encryption keys are statically embedded directly into the application binary or configuration files rather than being generated dynamically during runtime or provisioned securely through a trusted hardware module. In modern security architectures, hard-coding secrets creates a single point of failure where compromise of one instance compromises all instances using the same key material. For an Internet of Things (IoT) device like the EasyIO FS32, which often serves as a gateway for building automation systems, this architectural weakness undermines the fundamental principle of confidentiality and integrity required to protect operational technology data from unauthorized access.
From a technical perspective, the presence of hard-coded keys allows attackers who gain read access to the firmware image or memory dump to extract these credentials without requiring any additional exploitation steps beyond standard reverse engineering techniques. Once extracted, these keys can be used to decrypt sensitive traffic intercepted between the device and its management interface or backend servers. This capability effectively neutralizes encryption protections that are intended to secure communications against eavesdropping and man-in-the-middle attacks. The attacker does not need to exploit a separate logic flaw to break the cipher; instead, they simply retrieve the pre-shared secret used by the cryptographic algorithm, rendering any encrypted data transmitted over the network trivially decodable for anyone with access to the firmware binary or physical device memory.
The operational impact of this vulnerability is severe, particularly in industrial and commercial building management contexts where the EasyIO FS32 operates. An adversary possessing the hard-coded key can perform passive reconnaissance by decrypting historical traffic logs if they have captured network packets, revealing sensitive configuration details, user credentials, or real-time sensor data. Furthermore, possession of these keys enables active attacks such as session hijacking and impersonation. The attacker can inject malicious commands into the communication stream, potentially altering setpoints for heating, ventilation, and air conditioning systems, disabling security alarms, or manipulating environmental controls to cause physical damage or operational disruption. This aligns with ATT&CK technique T1538, which involves gathering cloud credentials from a local resource, although in this context it applies more broadly to embedded system secrets that facilitate unauthorized access to connected services and devices.
Mitigation strategies must address both the immediate remediation of the software flaw and broader architectural improvements for cryptographic key lifecycle management. The primary corrective action is to upgrade the EasyIO FS32 firmware to version 3.0b63 or later, where this vulnerability has been resolved by implementing dynamic key generation or secure storage mechanisms such as a Trusted Platform Module (TPM) or hardware security module (HSM). For devices that cannot be immediately upgraded, network segmentation is recommended to isolate the IoT segment from critical corporate networks, limiting the blast radius of any potential compromise. Additionally, organizations should implement strict access controls and monitor for anomalous traffic patterns indicative of decryption-based attacks. Long-term resilience requires adopting a zero-trust architecture where no device or user is trusted by default, ensuring that cryptographic keys are unique per device, rotated regularly, and stored in tamper-resistant hardware rather than embedded within software binaries.