CVE-2021-27649

9.8 criticalEPSS 2.0%

Critical (9.8) in synology. EPSS 2.0% chance of exploitation in the next 30 days.

Use after free vulnerability in file transfer protocol component in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to execute arbitrary code via unspecified vectors.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 2.0% chance of exploitation in the next 30 days; higher than 80% of CVEs (scores of 2026-10-31)
CWE: CWE-416
Published: 2021-06-23
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

synology:diskstation_manager
synology:diskstation_manager_unified_controller

References

https://www.synology.com/security/advisory/Synology_SA_20_26
https://www.synology.com/security/advisory/Synology_SA_20_26

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