CVE-2026-100737 in ADX5004
Summary
by MITRE • 10/20/2026
Hidden functionality issue exists in Multiple DVRs (Digital Video Recorders) provided by Atsumi Electric Co., Ltd. A user who can log in to the product with the administrator privilege may upgrade the affected product to unauthorized firmware.
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Analysis
by VulDB Data Team • 10/20/2026
The vulnerability identified involves a critical flaw within the firmware update mechanism of Digital Video Recorders manufactured by Atsumi Electric Co., Ltd. This issue falls under the category of hidden functionality, where features intended for development or maintenance are inadvertently exposed to end-users with administrative privileges. Specifically, the system allows an authenticated administrator to initiate and execute unauthorized firmware upgrades. While administrators typically possess elevated rights for configuration management, they should not have unrestricted access to low-level system components such as bootloader interfaces or raw firmware flashing utilities unless explicitly required for specific operational tasks. The presence of this hidden functionality suggests that development tools were left enabled in production builds without adequate access controls or user interface restrictions.
From a technical perspective, the flaw lies in the insufficient validation and authorization checks surrounding the firmware update process. When an administrator attempts to upload new firmware, the system fails to verify whether the source is authorized or if the action aligns with standard operational procedures. This lack of integrity checking allows for the installation of arbitrary code onto the device's storage media. In many embedded systems, including DVRs, the bootloader often lacks robust signature verification during this phase, meaning that a maliciously crafted firmware image can be flashed without triggering security alerts or preventing execution. This effectively bypasses any intended separation between administrative configuration and system-level modifications.
The operational impact of this vulnerability is severe, as it compromises the integrity and availability of the surveillance infrastructure. An attacker with valid administrator credentials could install modified firmware that contains backdoors, malware, or logic bombs designed to disrupt video recording capabilities. Alternatively, an insider threat actor could downgrade the device to a vulnerable version known to contain other exploits, thereby re-introducing previously patched security weaknesses. Furthermore, unauthorized firmware changes can alter network configurations, potentially exposing internal camera feeds to external networks or disabling logging mechanisms that are essential for forensic analysis after a security incident. This undermines the core purpose of DVRs, which is to provide reliable and tamper-proof evidence storage.
This vulnerability aligns with CWE-16, known as Configuration, where improper settings lead to security weaknesses, specifically relating to hidden functionality being exposed. It also maps closely to MITRE ATT&CK technique T1531, Accessing Cloud Infrastructure Credentials or Accounts, adapted here for local embedded systems, and potentially T1074, Data Staged, if the attacker uses the device as a staging ground after gaining control through firmware modification. The ability to modify system software directly correlates with privilege escalation in terms of impact, even if the initial access was via legitimate administrative credentials.
Mitigation strategies must focus on restricting access to sensitive maintenance functions and ensuring strict integrity verification for all system updates. Atsumi Electric Co., Ltd. should immediately disable or remove any hidden firmware upgrade interfaces from production builds unless they are strictly necessary and protected by multi-factor authentication or hardware-based security modules like TPMs. Implementing secure boot mechanisms that verify digital signatures of firmware images before installation is critical to preventing the execution of unauthorized code. Additionally, administrators should be educated on the principle of least privilege, ensuring that administrative accounts do not possess unnecessary low-level system access rights. Regular audits of device configurations and monitoring for unusual firmware change events can also help detect potential exploitation attempts early in their lifecycle.