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CVE-2021-47961

HIGH
8.1
CVSS Score
Published: April 10, 2026 at 09:22 AM UTC
Updated: June 17, 2026 at 04:18 AM UTC
1 product affected across 1 vendorSSL VPN Client

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Severity
HIGH8.1
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

SSL VPN Client· Synology
95%
v < 1.4.5-0684
Affected range stops below 1.4.5-0684, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://www.synology.com/en-global/security/advisory/Synology_SA_26_05

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGHsynology
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-256

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