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Vulnerability Details :

CVE-2021-47961

Summary
Assigner-synology
Assigner Org ID-db201096-a0cc-46c7-9a55-61d9e221bf01
Published At-10 Apr, 2026 | 09:22
Updated At-10 Apr, 2026 | 12:42
Rejected At-
Credits

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:synology
Assigner Org ID:db201096-a0cc-46c7-9a55-61d9e221bf01
Published At:10 Apr, 2026 | 09:22
Updated At:10 Apr, 2026 | 12:42
Rejected At:
▼CVE Numbering Authority (CNA)

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.

Affected Products
Vendor
Synology, Inc.Synology
Product
Synology SSL VPN Client
Default Status
affected
Versions
Affected
  • From * before 1.4.5-0684 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-256Plaintext Storage of a Password
Type: CWE
CWE ID: CWE-256
Description: Plaintext Storage of a Password
Metrics
VersionBase scoreBase severityVector
3.18.1HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Version: 3.1
Base score: 8.1
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Laurent Sibilla (https://www.linkedin.com/in/lsibilla/)
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://www.synology.com/en-global/security/advisory/Synology_SA_26_05
vendor-advisory
Hyperlink: https://www.synology.com/en-global/security/advisory/Synology_SA_26_05
Resource:
vendor-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security@synology.com
Published At:10 Apr, 2026 | 10:16
Updated At:13 Apr, 2026 | 15:02

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.18.1HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Type: Primary
Version: 3.1
Base score: 8.1
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-256Primarysecurity@synology.com
CWE ID: CWE-256
Type: Primary
Source: security@synology.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://www.synology.com/en-global/security/advisory/Synology_SA_26_05security@synology.com
N/A
Hyperlink: https://www.synology.com/en-global/security/advisory/Synology_SA_26_05
Source: security@synology.com
Resource: N/A

Change History

0
Information is not available yet

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Matching Score-8
Assigner-Synology Inc.
ShareView Details
Matching Score-8
Assigner-Synology Inc.
CVSS Score-8.1||HIGH
EPSS-0.36% / 57.98%
||
7 Day CHG~0.00%
Published-06 Jul, 2022 | 07:35
Updated-16 Sep, 2024 | 16:18
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

Session fixation vulnerability in access control management in Synology Photo Station before 6.8.16-3506 allows remote attackers to bypass security constraint via unspecified vectors.

Action-Not Available
Vendor-Synology, Inc.
Product-photo_stationPhoto Station
CWE ID-CWE-384
Session Fixation
Details not found