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 potential interception of subsequent VPN traffic when combined with user interaction.

EPSS: 0.003 (24.7th 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

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.