CVE-2025-54158 identifies a missing authentication vulnerability in Synology BeeDrive for desktop versions before 1.4.2-13960. BeeDrive is a desktop client for Synology's cloud storage and backup solutions, widely used for file synchronization and backup. The vulnerability arises because a critical function within the application does not enforce authentication checks, allowing any local user with limited privileges (PR:L) to invoke this function and execute arbitrary code. The attack vector is local (AV:L), meaning an attacker must have access to the machine but does not require elevated privileges or user interaction (UI:N). The vulnerability affects all versions prior to the fixed release, indicating a broad exposure. Exploitation could lead to full compromise of the affected system, including unauthorized data access, modification, or disruption of services. The CVSS 3.1 vector (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) indicates low attack complexity, no user interaction, and high impact on confidentiality, integrity, and availability. No public exploits are known yet, but the vulnerability’s nature makes it a critical concern for environments where multiple users share access or where local access controls are weak. The lack of authentication on a critical function is a fundamental security flaw that undermines the trust boundary within the application. Synology users should prioritize upgrading to version 1.4.2-13960 or later to remediate this issue.

For European organizations, this vulnerability poses a significant risk, especially in sectors relying on Synology BeeDrive for secure file storage and backup, such as finance, healthcare, and government. The ability for a local user to execute arbitrary code without authentication could lead to insider threats or lateral movement by attackers who gain initial local access through other means. Confidentiality breaches could expose sensitive personal data protected under GDPR, leading to regulatory penalties and reputational damage. Integrity and availability impacts could disrupt business continuity, causing data loss or service outages. Organizations with shared workstations or insufficient endpoint security controls are particularly vulnerable. The risk is amplified in environments where Synology devices are integrated into critical infrastructure or used for backup of essential data. Although no exploits are currently reported in the wild, the vulnerability’s characteristics suggest it could be weaponized quickly once publicly disclosed, making proactive mitigation critical.

1. Immediately update Synology BeeDrive for desktop to version 1.4.2-13960 or later, where the vulnerability is patched. 2. Restrict local user access on systems running BeeDrive to trusted personnel only, minimizing the risk of exploitation by unauthorized users. 3. Implement strict endpoint security controls, including application whitelisting and behavior monitoring, to detect and prevent unauthorized code execution. 4. Use least privilege principles to limit user permissions on affected systems, reducing the attack surface. 5. Monitor system logs and audit trails for unusual activity related to BeeDrive processes or unexpected privilege escalations. 6. Consider network segmentation to isolate critical systems running BeeDrive from less secure user environments. 7. Educate users about the risks of local access vulnerabilities and enforce strong physical security controls to prevent unauthorized access. 8. Regularly review and update security policies to incorporate emerging threats related to local privilege escalation and authentication bypass.