CVE-2021-27646
CRITICAL
9.8
CVSS Score
Published: March 12, 2021 at 06:45 AM UTC
Updated: June 17, 2026 at 03:45 AM UTC
1 product affected across 1 vendorDiskStation Manager
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Severity
CRITICAL9.8
Exploit prediction
EPSS 4%
Description
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
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 6.2.3-25426-3
Affected range stops below 6.2.3-25426-3, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (3)
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://www.synology.com/security/advisory/Synology_SA_20_26x_refsource_MISCNot Applicable
Source: [email protected]
https://www.zerodayinitiative.com/advisories/ZDI-21-339/x_refsource_MISCThird Party AdvisoryVDB Entry
Source: [email protected]
https://www.zerodayinitiative.com/advisories/ZDI-21-340/CVSS
9.8CRITICALsynology
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-416
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