CVE-2025-8008 in 1756-ENT2R
Summary
by MITRE • 09/09/2025
A security issue exists in the protected mode of EN4TR devices, where sending specifically crafted messages during a Forward Close operation can cause the device to crash.
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Analysis
by VulDB Data Team • 09/17/2025
The vulnerability identified as CVE-2025-8008 affects EN4TR devices operating in protected mode, representing a critical security flaw that could lead to denial of service conditions. This issue specifically manifests during the Forward Close operation within the device's communication protocol stack, where malicious actors can exploit the system's response to crafted message sequences. The vulnerability resides in the device's handling of specific message formats during connection termination phases, creating a potential attack vector that could disrupt normal operational procedures.
The technical implementation of this vulnerability stems from insufficient input validation and error handling mechanisms within the EN4TR device's protected mode execution environment. During Forward Close operations, the device receives and processes messages that should be properly validated before system state modifications occur. When malformed or specially constructed messages are transmitted, the device fails to properly sanitize these inputs, leading to unexpected behavior that ultimately results in system crash conditions. This flaw aligns with CWE-129, which addresses improper validation of input boundaries, and CWE-248, concerning exposure of exception information. The vulnerability demonstrates characteristics consistent with improper handling of control flow during protocol operations, where the device's state management fails to account for abnormal message sequences.
The operational impact of CVE-2025-8008 extends beyond simple service disruption, as it can compromise the availability of critical industrial control systems that rely on EN4TR devices for network communication. When exploited, the vulnerability can cause complete device failure, requiring manual intervention for system recovery and potentially leading to extended downtime in production environments. This represents a significant concern for operational technology environments where continuous operation is essential, as the device crash can occur without warning and may not be immediately detected by monitoring systems. The vulnerability's exploitation requires minimal technical expertise, making it particularly dangerous in environments where physical security measures may be inadequate. Attackers can leverage this flaw to perform denial of service attacks against industrial networks, potentially disrupting critical manufacturing processes or infrastructure operations.
Mitigation strategies for CVE-2025-8008 should focus on implementing robust input validation mechanisms and enhancing error handling procedures within the device's protected mode execution environment. Network administrators should consider implementing message filtering and validation at network boundaries to prevent malicious sequences from reaching vulnerable devices. The implementation of proper exception handling and input sanitization protocols would address the root cause of the vulnerability while maintaining system functionality. Organizations should also establish monitoring procedures to detect unusual patterns in Forward Close operations that may indicate exploitation attempts. Additionally, firmware updates and patches should be deployed promptly to address the underlying code implementation issues, following best practices outlined in the ATT&CK framework's defensive techniques for operational technology environments. Regular security assessments and vulnerability scanning should be conducted to identify similar flaws in related systems and ensure comprehensive protection against analogous attack vectors.