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TI-2021-13805 Aliases CVE-2021-34811GHSA-h4r4-pw7f-hp8j

Server-side request forgery in Synology Download Station

Priority LOW 24CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.00764 55th percentileScored 2026-11-07
Fix Fixed Download Station (Synology): 3.8.16-3566

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
SynologyDownload Stationbefore 3.8.16-35663.8.16-3566Patch availableCNA
  • Download Station VendorSynology Affected before 3.8.16-3566 Fixed in 3.8.16-3566 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:synology:download_station:*:*:*:*:*:*:*:*before 3.8.16-3566VulnerableSynology
  • cpe:2.3:a:synology:download_station:*:*:*:*:*:*:*:* Versions before 3.8.16-3566 Vulnerable ·Synology

Remediation

  • Fix · CNA Download Station (Synology) Fixed in 3.8.16-3566

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Synology Download Station 3.8.16-3566

    3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2021-13803 Command injection in Synology Download StationPriority MEDIUM 46
    • TI-2021-13804 Improper privilege management in Synology Download StationPriority MEDIUM 45
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-34811
  2. 2026-10-03 Alias added: GHSA-h4r4-pw7f-hp8j

References

Advisory 1

  • TI-2021-13803 Command injection in Synology Download Station CVSS 3.1CRITICAL 9.9
  • TI-2021-13804 Improper privilege management in Synology Download Station CVSS 3.1CRITICAL 9.9
  • TI-2017-08213 Incorrect default permissions in Synology Download Station CVSS 3.0HIGH 7.8
  • TI-2021-12735 Server-side request forgery in Synology Download Station CVSS 3.1HIGH 7.7
  • TI-2017-08206 Server-side request forgery in Synology Download Station CVSS 3.0MEDIUM 6.5
  • TI-2015-05767 Cross-site scripting (XSS) vulnerability in the "Create download task via URL" feature in… CVSS 2.0MEDIUM 4.3
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences