CVE-2021-26569: Synology Diskstation Manager

High severity, CVSS 8.1. EPSS: 2.3% chance of exploitation in the next 30 days.

Race Condition within a Thread vulnerability in iscsi_snapshot_comm_core in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to execute arbitrary code via crafted web requests.

Affected products

• Synology Diskstation Manager: before 6.2.3-25426-3 (fixed in 6.2.3-25426-3)

Published 2021-03-12. Last modified 2026-06-17.