CVE-2021-27646: Synology Diskstation Manager

Critical severity, CVSS 9.8. EPSS: 3.9% chance of exploitation in the next 30 days.

Use After Free 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.