PT-2026-31906 · Synology · Synology Ssl Vpn Client

Laurent Sibilla · Published 2026-04-10 · Updated 2026-04-20 · CVE-2021-47961

Positive Technologies (AI Summary)

CVSS v2.0

9.4

High

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:N

Name of the Vulnerable Software and Affected Versions Synology SSL VPN Client versions prior to 1.4.5-0684

Description A security issue exists in Synology SSL VPN Client that allows remote attackers to access or influence a user's PIN code due to insecure storage. This could lead to unauthorized VPN configuration and potential interception of VPN traffic if a user interacts with the system.

Recommendations Update to version 1.4.5-0684 or later.

Fix

Weakness Enumeration

CWE-256

Related Identifiers

BDU:2026-05282

CVE-2021-47961

Affected Products

Synology Ssl Vpn Client

References · 7

• https://synology.com/en-global/security/advisory/Synology_SA_26_05 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-05282 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-47961 · Security Note
• https://twitter.com/autumn_good_35/status/2043717125282664943 · Twitter Post
• https://twitter.com/giuseppe_1337/status/2046052554178527398 · Twitter Post
• https://twitter.com/CVEnew/status/2042561704522060057 · Twitter Post
• https://twitter.com/CVEarity/status/2043234069958533139 · Twitter Post