EUVD-2025-17345
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Description
An improper certificate validation vulnerability has been reported to affect File Station 5. If exploited, the vulnerability could allow remote attackers who have gained user access to compromise the security of the system. We have already fixed the vulnerability in the following versions: File Station 5 5.5.6.4791 and later and later
Analysis
CVE-2025-29884 is an improper certificate validation vulnerability affecting Synology File Station 5 that allows authenticated remote attackers to compromise system confidentiality, integrity, and availability. The vulnerability requires user-level access but enables complete system compromise with high impact across all security dimensions. No active KEV or public POC data is currently available, but the CVSS 8.8 score and low attack complexity indicate this should be prioritized for patching.
Technical Context
This vulnerability stems from improper certificate validation (CWE-295), a common SSL/TLS implementation flaw where the application fails to properly verify X.509 certificates during secure communications. In File Station 5, this likely affects HTTPS/TLS connections used for web interface authentication, file transfer operations, or backend service communications. The vulnerability allows attackers who have already obtained legitimate user credentials to perform man-in-the-middle (MITM) attacks by presenting invalid or self-signed certificates that the application fails to validate, bypassing intended security controls. The affected product CPE would be: cpe:2.3:a:synology:file_station:5.0:*:*:*:*:*:*:* through versions prior to 5.5.6.4791.
Affected Products
File Station 5 (All versions prior to 5.5.6.4791)
Remediation
Upgrade File Station 5 to version 5.5.6.4791 or later immediately; priority: Critical; details: Apply official Synology security patch. Check Synology's advisory portal and download center for File Station 5 updates Workaround (Temporary): Restrict network access to File Station 5 web interface to trusted IP ranges using firewall rules; priority: High; details: Limit exposure while patch deployment is being staged; implement VPN-only access if possible Monitoring: Monitor for suspicious certificate warnings in File Station logs and failed HTTPS connections; priority: High; details: Establish alerting for TLS/certificate validation failures that may indicate MITM attempts Credential Review: Reset user credentials for high-privilege File Station accounts as a precautionary measure post-patching; priority: Medium; details: If any suspicious activity occurred, assume credential compromise and enforce password resets
Priority Score
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External POC / Exploit Code
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