CVE-2021-47961 - CVE House
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Status published High CVE-2021-47961

A plaintext storage of a password vulnerability in Synology SSL...

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Laurent Sibilla (https://www.linkedin.com/in/lsibilla/)

References

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Affected Vendor

Affected Software

Synology SSL VPN Client
Vulnerable Versions:
*

Timeline

Official Publish: April 10th, 2026
Last Modified: April 10th, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Weaknesses (CWE)

CWE-256

MITRE ATT&CK TTPs

T1552 Unsecured Credentials
Credential Access
T1005 Data from Local System
Collection
T1078 Valid Accounts
Persistence