CVE-2021-47961

HIGH

Synology SSL VPN Client <1.4.5-0684 - Info Disclosure

Title source: llm
STIX 2.1

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.

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory
Synology-SA-26:05 Synology SSL VPN Client
https://www.synology.com/en-global/security/advisory/Synology_SA_26_05

Scores

CVSS v3 8.1
EPSS 0.0032
EPSS Percentile 23.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-256
Status published
Products (2)
synology/ssl_vpn_client < 1.4.5-0684
Synology/Synology SSL VPN Client < 1.4.5-0684
Published Apr 10, 2026
Tracked Since Apr 10, 2026