CVE-2025-66593
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAn origin validation error vulnerability in Synology Assistant before 7.0.6-50085 allows local users to write arbitrary files with restricted content and conduct denial-of-service during installation.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceAn origin validation error in Synology Assistant before version 7.0.6-50085 allows local authenticated users to bypass validation checks during the installation process, enabling writes of arbitrary files with restricted content to the filesystem and causing denial-of-service conditions.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 7.0.6-50085CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Verify Synology Assistant is installedCheck for Synology Assistant installation by looking in common installation directories (e.g., Program Files/Synology on Windows, /Applications on macOS, or search for 'Synology Assistant' in the system), or check if the service/daemon is runningAffected if Synology Assistant is installed on the system
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Identify installed versionOpen Synology Assistant, go to Help > About, or run 'Synology Assistant' from the command line with a version flag if available. On Windows, right-click the application and select Properties > Details to view the versionAffected if The installed version cannot be determined or is older than 7.0.6-50085
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Compare version against vulnerable rangeCompare your identified version number to the affected range: versions prior to 7.0.6-50085 are vulnerable. The version format typically appears as '7.0.x-xxxxx'Affected if The installed version is less than 7.0.6-50085 (for example, 7.0.5-50080 or any earlier version)
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Check for local authenticated accessVerify that local user accounts with authentication credentials exist on the system where Synology Assistant is installed, as the vulnerability requires a local authenticated userAffected if Local authenticated users exist on the system and Synology Assistant version is below 7.0.6-50085
You are affected if Synology Assistant is installed with a version lower than 7.0.6-50085 and local authenticated users can access the system.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped7.0.6-50085
Upgrade Synology Assistant to version 7.0.6-50085 or later to resolve the origin validation vulnerability.
7.0.6-50085
- 1. Close any running instances of Synology Assistant
- 2. Download Synology Assistant version 7.0.6-50085 or later from the official Synology download center at www.synology.com
- 3. Run the installer and follow the on-screen prompts to upgrade
- 4. Verify the installed version by checking Help > About in Synology Assistant
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-66593 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-66593 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data