CVE-2021-47961 Information disclosure in Synology SSL VPN Client
Attackers can access stored PIN codes due to plaintext storage, enabling unauthorized VPN configuration and potential traffic interception.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-47961?
CVE-2021-47961 is a high-severity vulnerability in Synology SSL VPN Client, published on 10 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-256
Which versions are affected by CVE-2021-47961?
It affects 1 product.
Products include Synology Ssl Vpn Client.
How do I fix CVE-2021-47961?
No fix has been published for CVE-2021-47961 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-47961 being exploited?
There is no known exploitation of CVE-2021-47961 in the wild and no public exploit code.
Other vulnerabilities in Synology SSL VPN Client
Sources
Also known as GHSA-2jcx-2m59-6cv8.