CVE-2021-25509
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 · uneditedA missing input validation in Samsung Flow Windows application prior to Version 4.8.5.0 allows attackers to overwrite abtraty file in the Windows known folders.
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 · high confidenceA missing input validation vulnerability in Samsung Flow Windows application prior to version 4.8.5.0 allows attackers to overwrite arbitrary files in Windows known folders (e.g., Documents, Downloads, Desktop). The flaw likely stems from insufficient path sanitization when handling file operations, enabling path traversal or improper path construction that bypasses intended access restrictions.
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< 4.8.5.0CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/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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Check if Samsung Flow is installedOpen Windows Settings > Apps > Apps & features, search for 'Samsung Flow' in the installed applications listAffected if Samsung Flow is not found in the installed programs list - not affected; if found, proceed to version check
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Find the installed version of Samsung FlowRight-click the Samsung Flow shortcut (Start menu or Desktop) > Properties > Details tab, or open the app and navigate to Settings > About to view the version numberAffected if Version displayed is lower than 4.8.5.0 - the vulnerability is present
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Verify the file sync feature is in useCheck if Samsung Flow has active paired devices with file sync enabled - open Samsung Flow > look for paired phone/tablet with sync features configuredAffected if Samsung Flow with active file sync to a mobile device increases exposure to this vulnerability
If Samsung Flow Windows application version 4.8.5.0 or higher is installed, the environment is not affected by this path traversal vulnerability; versions below 4.8.5.0 with active Samsung Flow usage are affected.
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 · scoped4.8.5.0
Update Samsung Flow Windows application to version 4.8.5.0 or later to obtain the patched build with proper input validation for file operations.
Samsung Flow 4.8.5.0 or later
- 1. Open the Samsung Flow application on your Windows device
- 2. Navigate to the application settings or help section
- 3. Check the current installed version of Samsung Flow
- 4. If the version is below 4.8.5.0, uninstall the current version from Windows Settings > Apps
- 5. Download the latest version of Samsung Flow from the official Samsung website or Microsoft Store
- 6. Install Samsung Flow version 4.8.5.0 or later
- 7. Verify the installation by checking the application version in Settings > Apps
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-25509 — 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-2021-25509 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
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