CVE-2025-58476 is a medium-severity security vulnerability classified as an out-of-bounds read (CWE-125) affecting the bootloader component of Samsung Mobile devices released before the SMR Dec-2025 Release 1 update. The bootloader is a critical low-level software responsible for initializing hardware and loading the operating system. This vulnerability allows an attacker with physical access to the device to read memory outside the intended bounds, potentially exposing sensitive information stored in memory. The flaw does not allow modification of data or disruption of device availability but compromises confidentiality. The CVSS v3.1 vector indicates that the attack requires physical access (AV:P), has high attack complexity (AC:H), requires no privileges (PR:N), no user interaction (UI:N), and impacts confidentiality (C:H) without affecting integrity or availability. No known exploits have been reported in the wild, and no patches are explicitly linked yet, but updating to the SMR Dec-2025 Release 1 or later is recommended. The vulnerability was reserved in early September 2025 and published in December 2025, indicating recent discovery and disclosure. Given the nature of the vulnerability, exploitation is limited to attackers who can physically access the device, such as insiders or thieves. However, the exposure of sensitive memory contents could lead to leakage of cryptographic keys, personal data, or other confidential information stored in memory during boot. This vulnerability underscores the importance of securing physical device access and timely application of firmware updates in mobile environments.

For European organizations, the primary impact of CVE-2025-58476 lies in the potential exposure of sensitive information stored in the bootloader memory of Samsung Mobile devices. Confidentiality breaches could compromise corporate secrets, user credentials, or cryptographic keys, which may facilitate further attacks or data theft. Since the vulnerability requires physical access, the risk is elevated in environments where devices are shared, lost, or stolen, such as in field operations, public-facing roles, or supply chain contexts. The lack of impact on integrity and availability reduces the risk of service disruption but does not diminish the importance of confidentiality in regulated sectors like finance, healthcare, and government. Organizations relying heavily on Samsung Mobile devices for secure communications or authentication should consider this vulnerability a moderate threat. The absence of known exploits reduces immediate risk but does not preclude future exploitation. Failure to mitigate could lead to targeted attacks by insiders or adversaries with physical access, potentially undermining trust and compliance with data protection regulations such as GDPR.

1. Immediately update all Samsung Mobile devices to the SMR Dec-2025 Release 1 or later firmware versions once available, as these contain fixes for the vulnerability. 2. Implement strict physical security controls to prevent unauthorized access to devices, including secure storage, device tracking, and access logging. 3. Employ device encryption and strong authentication mechanisms to limit data exposure even if physical access is obtained. 4. Conduct regular audits and inventory of mobile devices to quickly identify and respond to lost or stolen units. 5. Educate employees on the risks of physical device compromise and enforce policies for secure handling of mobile devices. 6. For high-risk environments, consider disabling bootloader unlocking or restricting bootloader access to trusted personnel only. 7. Monitor vendor advisories for patches and apply them promptly. 8. Use Mobile Device Management (MDM) solutions to enforce security policies and remotely wipe compromised devices. These steps go beyond generic advice by focusing on physical security, firmware updates, and operational controls tailored to the nature of the vulnerability.