CVE-2023-5748

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-11-07 · updated 2026-06-17
Weakness: CWE-120

Description

Buffer copy without checking size of input ('Classic Buffer Overflow') vulnerability in cgi component in Synology SSL VPN Client before 1.4.7-0687 allows local users to conduct denial-of-service attacks via unspecified vectors.

Affected products

Synology SSL VPN Client: before 1.4.7-0687 — fixed in 1.4.7-0687

How to fix

Upgrade to a fixed version: Synology SSL VPN Client 1.4.7-0687. Check the vendor advisory for mitigations.

References

https://www.synology.com/en-global/security/advisory/Synology_SA_23_12
https://www.synology.com/en-global/security/advisory/Synology_SA_23_12

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