CVE-2021-34808

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-06-18 · updated 2026-06-17
Weakness: CWE-918

Description

Server-Side Request Forgery (SSRF) vulnerability in cgi component in Synology Media Server before 1.8.3-2881 allows remote attackers to access intranet resources via unspecified vectors.

Affected products

Synology Media Server: before 1.8.3-2881 — fixed in 1.8.3-2881

How to fix

Upgrade to a fixed version: Synology Media Server 1.8.3-2881. Check the vendor advisory for mitigations.

References

https://www.synology.com/security/advisory/Synology_SA_21_10
https://www.synology.com/security/advisory/Synology_SA_21_10

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