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TI-2021-09097 Aliases CVE-2021-27646GHSA-qm39-44mj-vqvq

Use after free in Synology DiskStation Manager

Priority MEDIUM 49CWE-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 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.

Why it matters now

EPSS 0.0392 90th percentileScored 2026-11-07
Fix Fixed Synology 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
SynologySynology DiskStation Manager (DSM)before 6.2.3-25426-36.2.3-25426-3Patch availableCNA
  • Synology DiskStation Manager (DSM) VendorSynology Affected before 6.2.3-25426-3 Fixed in 6.2.3-25426-3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:synology:diskstation_manager:*:*:*:*:*:*:*:*before 6.2.3-25426-3VulnerableSynology
  • cpe:2.3:o:synology:diskstation_manager:*:*:*:*:*:*:*:* Versions before 6.2.3-25426-3 Vulnerable ·Synology

Remediation

  • Fix · CNA Synology 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

    3 records Highest priority Priority MEDIUM 3 MEDIUM

    Other records, highest priority first

    • TI-2021-09098 Out-of-bounds read in Synology DiskStation ManagerPriority MEDIUM 48
    • TI-2021-08292 Race condition in Synology DiskStation ManagerPriority MEDIUM 46
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-27646
  2. 2026-10-03 Alias added: GHSA-qm39-44mj-vqvq

References

Advisory 2

Other 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