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TI-2021-22574 Aliases CVE-2021-47961GHSA-2jcx-2m59-6cv8

A plaintext storage of a password vulnerability in Synology SSL VPN Client before…

Priority LOW 37CWE-256Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-256.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00328 26th percentileScored 2026-11-07
Fix Fixed Synology SSL VPN Client (Synology): 1.4.5-0684

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SynologySynology SSL VPN Clientbefore 1.4.5-06841.4.5-0684Patch availableCNA
  • Synology SSL VPN Client VendorSynology Affected before 1.4.5-0684 Fixed in 1.4.5-0684 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:synology:ssl_vpn_client:*:*:*:*:*:*:*:*before 1.4.5-0684VulnerableSynology
  • cpe:2.3:a:synology:ssl_vpn_client:*:*:*:*:*:*:*:* Versions before 1.4.5-0684 Vulnerable ·Synology

Remediation

  • Fix · CNA Synology SSL VPN Client (Synology) Fixed in 1.4.5-0684

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Synology SSL VPN Client — Synology-SA-26:05 Synology SSL VPN Client

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2021-22573 A files or directories accessible to external parties vulnerability in Synology SSL VPN…Priority LOW 28
    Show all 2 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-47961
  2. 2026-10-03 Alias added: GHSA-2jcx-2m59-6cv8

References

Advisory 1

  • TI-2018-09531 Lack of administrator control over security vulnerability in client.cgi in Synology SSL… CVSS 3.0HIGH 8.8
  • TI-2018-06467 Cleartext transmission of sensitive information in Synology SSL VPN Client CVSS 3.0HIGH 8.1
  • TI-2021-22573 A files or directories accessible to external parties vulnerability in Synology SSL VPN… CVSS 3.1MEDIUM 6.5
  • TI-2023-05287 Buffer overflow in Synology SSL VPN Client CVSS 3.1MEDIUM 5.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences