High severity · published Mar 12, 2021
CVE-2021-26569
Race Condition within a Thread vulnerability in iscsi_snapshot_comm_core in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to execute arbitrary…
8.1
CVSS
2.3%
EPSS
No
On KEV
Description
Race Condition within a Thread 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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.3% · higher than 83% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DM
Diskstation Manager · Synology
before 6.2.3-25426-3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26569
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-26569
Vendor Advisory
https://www.synology.com/security/advisory/Synology_SA_20_26
Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-338/
More from Diskstation Manager
7.8
CVE-2021-3156
Sudo Heap-Based Buffer Overflow Vulnerability
9.8
CVE-2025-13392
Improper check for unusual or exceptional conditions vulnerability in SSO in Synology DiskStation Manager (DSM) before 7.2.2-72806-5 and 7.3.1-86003-1 (7.2.1-69057 is not…
9.8
CVE-2024-10441
Improper encoding or escaping of output vulnerability in the system plugin daemon in Synology BeeStation OS (BSM) before 1.1-65374 and Synology DiskStation Manager (DSM) before…
9.8
CVE-2022-27624
A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the packet decryption functionality of Out-of-Band (OOB) Management
9.8
CVE-2022-27625
A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the message processing functionality of Out-of-Band (OOB) Management