Home / Vulnerability Intelligence / CVE-2021-47961

CVE-2021-47961 - Vulnerability Analysis

HighCVSS: 8.1

Last Updated: April 10, 2026

Synology SSL VPN Client - Authentication Bypass

Published: April 10, 2026Updated: April 10, 2026Remote Exploitable

Overview

Synology SSL VPN Client < 1.4.5-0684 contains a plaintext password storage vulnerability caused by insecure storage, letting remote attackers access or influence user's PIN code, exploit requires user interaction.

Severity & Score

Severity: High

CVSS Score: 8.1

Impact

Remote attackers can access user's PIN code, potentially leading to unauthorized VPN configuration and interception of VPN traffic.

Mitigation

Update to version 1.4.5-0684 or later.

References

https://www.synology.com/en-global/security/advisory/Synology_SA_26_05

Related Resources

Vulnerability Intelligence Dashboard
Credential Scanner

Details

CVE ID: CVE-2021-47961
Severity: High
CVSS Score: 8.1
Type: broken_authentication
Status: new

CWE

CWE-256

CVSS Metrics

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N