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TI-2021-09100 Aliases CVE-2021-27649GHSA-59pm-73xx-3pvc

Use after free in Synology DiskStation Manager

Priority MEDIUM 46CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.02007 80th percentileScored 2026-11-07
Fix Fixed DiskStation Manager (DSM) (Synology): 6.2.3-25426-3

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
SynologyDiskStation Manager (DSM)before 6.2.3-25426-36.2.3-25426-3Patch availableCNA
  • DiskStation Manager (DSM) VendorSynology Affected before 6.2.3-25426-3 Fixed in 6.2.3-25426-3 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:synology:diskstation_manager:*:*:*:*:*:*:*:*6.2 to before 6.2.3-25426-3VulnerableSynology
cpe:2.3:o:synology:diskstation_manager_unified_controller:*:*:*:*:*:*:*:*before 3.1-23033VulnerableSynology
  • cpe:2.3:o:synology:diskstation_manager:*:*:*:*:*:*:*:* Versions 6.2 to before 6.2.3-25426-3 Vulnerable ·Synology
  • cpe:2.3:o:synology:diskstation_manager_unified_controller:*:*:*:*:*:*:*:* Versions before 3.1-23033 Vulnerable ·Synology

Remediation

  • Fix · CNA DiskStation Manager (DSM) (Synology) Fixed in 6.2.3-25426-3

Fixed in the same release

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

  • Release ·

    Synology DiskStation Manager (DSM) 6.2.3-25426-3

    5 records Highest priority Priority MEDIUM 2 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2021-09972 Injection in Synology DiskStation ManagerPriority MEDIUM 40
    • TI-2021-09974 Path traversal in Synology DiskStation ManagerPriority LOW 36
    • TI-2021-09971 Injection in Synology DiskStation ManagerPriority LOW 36
    Show all 5 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-27649
  2. 2026-10-03 Alias added: GHSA-59pm-73xx-3pvc

References

Advisory 1

  • TI-2021-02242 Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer… KEVCVSS 3.1HIGH 7.8
  • TI-2018-01076 Out-of-bounds write in Netatalk CVSS 3.1CRITICAL 9.8
  • TI-2017-10594 Heap-based buffer overflow in dnsmasq before 2.78 allows remote attackers to cause a… CVSS 3.1CRITICAL 9.8
  • TI-2013-05716 webman/imageSelector.cgi in Synology DiskStation Manager (DSM) 4.0 before 4.0-2259, 4.2… CVSS 2.0HIGH 10.0
  • TI-2021-19843 Out-of-bounds read in Samba CVSS 3.1HIGH 8.8
  • TI-2017-11636 Command injection in Synology DiskStation Manager CVSS 3.0HIGH 8.8
See all 96 →

Sources

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