What is CVE-2021-47961?

CVE-2021-47961 is a high-severity vulnerability in Synology Ssl_vpn_client, classified under Plaintext Storage of a Password. CVSS score: 8.1/10. Published 2026-04-10.

How severe is CVE-2021-47961?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Synology Ssl_vpn_client

CVE-2021-47961

A plaintext storage of a password vulnerability in Synology SSL VPN Client before 1.4.5-0684 allows remote attackers to access or influence the user's PIN code due to insecure storage. This may lead to unauthorized VPN configuration and po…

EPSS: 0.000 (15.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Synology Ssl_vpn_client
Synology Ssl Vpn Client

Weakness classification (CWE)

CWE-256 — Plaintext Storage of a Password

References

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

Frequently asked questions

What is CVE-2021-47961?: CVE-2021-47961 is a high-severity vulnerability in Synology Ssl_vpn_client, classified under Plaintext Storage of a Password. CVSS score: 8.1/10. Published 2026-04-10.
How severe is CVE-2021-47961?: High severity. CVSS v3 base score is 8.1 out of 10.