Is CVE-2021-47960 in the CISA KEV catalog?

No. CVE-2021-47960 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-47960?

CVE-2021-47960 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-47960?

CVE-2021-47960 has an EPSS score of 0.19% (9th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-47960?

Upgrade ssl vpn client to 1.4.5-0684 or later.

CVE & CISA-KEV Catalog

CVE-2021-47960

MEDIUM

6.5

CVSS v3

NVD

Description

A files or directories accessible to external parties vulnerability in Synology SSL VPN Client before 1.4.5-0684 allows remote attackers to access files within the installation directory via a local HTTP server bound to the loopback interface. By leveraging user interaction with a crafted web page, attackers may retrieve sensitive files such as configuration files, certificates, and logs, leading to information disclosure.

CWE-552

How to fix

Remediation Available

ssl vpn clientNVD

Affected:< 1.4.5-0684Fixed in:1.4.5-0684CVE-2021-47960derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Exploit Intelligence

0.19%probability of exploitation in 30 days

9thpercentile

Low risk: more likely to be exploited than 9% of all known CVEs.

References

Vendor Advisory1

synology.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-29.