CVE-2021-34811

4.3 mediumEPSS 0.8%

Medium (4.3) in synology download station. EPSS 0.8% chance of exploitation in the next 30 days.

Server-Side Request Forgery (SSRF) vulnerability in task management component in Synology Download Station before 3.8.16-3566 allows remote authenticated users to access intranet resources via unspecified vectors.

Severity

CVSS 3.1

4.3 medium

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

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 55% of CVEs (scores of 2026-10-31)
CWE: CWE-918
Published: 2021-06-18
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

synology:download_station

References

https://www.synology.com/security/advisory/Synology_SA_21_11
https://www.synology.com/security/advisory/Synology_SA_21_11

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