CVE-2021-47960: Synology SSL VPN Client

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

A files or directories accessible to external parties vulnerability in Synology SSL VPN Client before 1.4.5-0684 allows remote attackers to access files within the installation directory via a local HTTP server bound to the loopback interface. By leveraging user interaction with a crafted web page, attackers may retrieve sensitive files such as configuration files, certificates, and logs, leading to information disclosure.

Affected products

• Synology SSL VPN Client: before 1.4.5-0684 (fixed in 1.4.5-0684)

Published 2026-04-10. Last modified 2026-06-17.