Medium severity · published Apr 10, 2026
CVE-2021-47960
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…
6.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SS
Synology SSL VPN Client · Synology
before 1.4.5-0684 · source: vendor
SV
Ssl Vpn Client · Synology
before 1.4.5-0684 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-47960
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-47960
Vendor Advisory
https://www.synology.com/en-global/security/advisory/Synology_SA_26_05
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8.1
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