What is CVE-2021-47960?

CVE-2021-47960 is a medium-severity vulnerability in Synology Ssl_vpn_client, classified under Files or Directories Accessible to External Parties. CVSS score: 6.5/10. Published 2026-04-10.

How severe is CVE-2021-47960?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Synology Ssl_vpn_client

CVE-2021-47960

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 interf…

EPSS: 0.000 (10.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Synology Ssl_vpn_client
Synology Ssl Vpn Client

Weakness classification (CWE)

CWE-552 — Files or Directories Accessible to External Parties

References

security@synology.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-47960?: CVE-2021-47960 is a medium-severity vulnerability in Synology Ssl_vpn_client, classified under Files or Directories Accessible to External Parties. CVSS score: 6.5/10. Published 2026-04-10.
How severe is CVE-2021-47960?: Medium severity. CVSS v3 base score is 6.5 out of 10.