Security readout for executives and security teams
Plain-English summary
Synology Assistant versions before 7.0.6-50085 have an origin validation flaw during installation. A local attacker could cause limited file writes or denial of service if a user interacts with the installer. This is not a remote network compromise issue, but it can disrupt endpoints or deployment workflows.
Executive priority
Treat this as a moderate endpoint maintenance issue. It is not described as remotely exploitable or actively exploited, but outdated installers can create preventable disruption and limited integrity risk during installation.
Technical view
The vulnerability is CWE-346, improper origin validation. CVSS 3.1 is 6.1 with local attack vector, low complexity, no privileges required, user interaction required, low integrity impact, and high availability impact. Sources describe arbitrary file write with restricted content and denial of service during installation.
Likely exposure
Exposure is likely limited to workstations or administrative systems using Synology Assistant before 7.0.6-50085, especially where older installers remain available. The source bundle does not identify Synology NAS firmware or other products as affected.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as KEV. Exploitation requires local access and user interaction during installation, which lowers broad internet risk but still matters on shared endpoints or managed deployment systems.
Researcher notes
Key constraints are local attack vector and user interaction during installation. The affected product is Synology Assistant before 7.0.6-50085. Evidence provided does not include exploit details, proof-of-concept status, affected operating systems, or additional mitigations beyond vendor update guidance.
Mitigation direction
- Upgrade Synology Assistant to 7.0.6-50085 or later.
- Remove cached or shared installers older than 7.0.6-50085.
- Restrict Synology Assistant installation to trusted administrators until updated.
- Review Synology-SA-25:17 for vendor-specific guidance.
- Prioritize systems used for IT administration or software deployment.
Validation and detection
- Inventory installed Synology Assistant versions across managed endpoints.
- Check software shares and deployment tools for older Synology Assistant installers.
- Confirm updated systems report version 7.0.6-50085 or later.
- Review endpoint logs for installation failures or unexpected file changes during installs.
- Verify no unsupported Synology products are assumed affected without vendor evidence.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-346: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2025-66593 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H1.84.2synologyVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Synology-SA-25:17 Synology AssistantCVE reference, synology · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Origin Validation Error
Origin Validation Error represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.