CVE-2025-29844 is a path traversal vulnerability identified in Synology Router Manager (SRM) version 1.3, specifically within the FileStation file CGI component. This vulnerability allows remote authenticated users to bypass intended directory restrictions and access file metadata and path information outside the authorized directory scope. The flaw arises from improper limitation of pathname inputs, enabling traversal to restricted directories. The vulnerability requires the attacker to have valid authentication credentials but does not require user interaction beyond that. The CVSS v3.1 base score is 4.3 (medium), reflecting low attack complexity and no user interaction, but limited confidentiality impact and no integrity or availability impact. Exploiting this vulnerability could allow an attacker to gather sensitive file system metadata, which may aid in further attacks or reconnaissance. No known public exploits or active exploitation have been reported to date. The vulnerability was reserved in March 2025 and published in December 2025. The absence of patch links suggests that a fix may be pending or recently released. Synology SRM is widely used in small to medium enterprise and home network environments for router management and NAS integration, making this vulnerability relevant to organizations relying on these devices for network infrastructure.

For European organizations, the primary impact of CVE-2025-29844 is the potential disclosure of sensitive file metadata and directory path information on affected Synology SRM devices. This information leakage could facilitate further targeted attacks, such as privilege escalation or lateral movement within networks. Although the vulnerability does not allow direct file modification or system disruption, the confidentiality breach can expose network topology details and file organization, which are valuable for attackers. Organizations in sectors with stringent data protection requirements, such as finance, healthcare, and government, may face increased risk if attackers leverage this information for subsequent exploits. The requirement for authentication limits exposure to internal or compromised users, but weak credential management or phishing could enable exploitation. Given the widespread use of Synology devices in European SMEs and home offices, the vulnerability could affect a broad range of targets, potentially impacting business continuity and data privacy compliance.

To mitigate CVE-2025-29844, organizations should take the following specific actions: 1) Monitor Synology’s official channels for patches addressing this vulnerability and apply updates promptly once available. 2) Restrict access to the FileStation interface by limiting it to trusted internal networks or VPN connections, reducing exposure to remote attackers. 3) Enforce strong authentication mechanisms, including multi-factor authentication (MFA), to prevent unauthorized access by compromised credentials. 4) Conduct regular audits of user accounts and permissions on Synology SRM devices to ensure least privilege principles are applied. 5) Implement network segmentation to isolate management interfaces from general user networks. 6) Employ intrusion detection systems (IDS) or endpoint detection and response (EDR) solutions to monitor for unusual access patterns or reconnaissance activities targeting SRM devices. 7) Educate users on phishing risks to reduce the likelihood of credential compromise. These targeted measures go beyond generic advice by focusing on access control hardening and proactive monitoring specific to the affected component and attack vector.