Vulnerability · Published Apr 10, 2026 · Assigned by synology

CVE-2021-47960

Medium 6.5

In plain English

A medium-severity security flaw in Synology SSL VPN Client from Synology. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.2%top 91.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 (as reported)

Vendor	Product	Versions
Synology	Synology SSL VPN Client	* – before 1.4.5-0684

Weakness: CWE-552 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References

Synology-SA-26:05 Synology SSL VPN Client vendor-advisory