CVE-2021-47961
8.1 · HIGHOverview
CVE-2021-47961 is a high-severity vulnerability affecting synology ssl_vpn_client. It was published on April 10, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from synology. Update ssl_vpn_client to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| synology | ssl_vpn_client | >= 0, < 1.4.5-0684 | Affected |
Frequently Asked Questions
What is CVE-2021-47961?
CVE-2021-47961 is a high-severity vulnerability affecting synology ssl_vpn_client. It was published on April 10, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2021-47961?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-47961?
Check the references section for vendor advisories and patches from synology. Update ssl_vpn_client to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-47961?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-47961 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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