CVE-2021-26565
MEDIUM
5.9
CVSS Score
Published: February 26, 2021 at 09:45 PM UTC
Updated: June 17, 2026 at 03:43 AM UTC
7 products affected across 1 vendorDiskStation ManagerVS960HD FirmwareDiskstation Manager Unified Controller
Using Synology DiskStation Manager (DSM) by Synology?
Get instant alerts when new vulnerabilities affect Synology DiskStation Manager (DSM) - before attackers find them.
Real-time alertsTrack your software stackFree plan available
Severity
MEDIUM5.9
Exploit prediction
EPSS 0.7%
Description
Cleartext transmission of sensitive information vulnerability in synorelayd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to obtain sensitive information via an HTTP session.
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
Skynas· Synologydevice
80%All versions
Uc3200· Synologydevice
80%All versions
VS960HD· Synologydevice
80%All versions
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (2)
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://www.synology.com/security/advisory/Synology_SA_20_26x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1160CVSS
- Attack Vector
- NETWORK
- Complexity
- HIGH
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- NONE
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-319
Get alerted
Stop reading CVE feeds looking for your own stack
Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.
Free plan, no card