CVE-2020-5639
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 · uneditedDirectory traversal vulnerability in FileZen versions from V3.0.0 to V4.2.2 allows remote attackers to upload an arbitrary file in a specific directory via unspecified vectors. As a result, an arbitrary OS command may be executed.
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 confidenceDirectory traversal vulnerability in FileZen V3.0.0-V4.2.2 allows remote unauthenticated attackers to upload arbitrary files to specific directories, enabling arbitrary OS command execution. The vulnerability stems from insufficient path validation in file upload functionality, enabling attackers to escape the intended upload directory and place executable files in locations where they can be invoked.
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>= 3.0.0, <= 4.2.2CVSS 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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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Confirm FileZen installationIdentify whether the Soliton FileZen application is installed on the system. Check for FileZen processes running or look for FileZen in installed programs.Affected if FileZen is found running or installed on the system
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Check installed FileZen versionDetermine the exact version of the installed FileZen application. Consult vendor documentation for version location or use system inventory tools.Affected if The installed version falls within the range 3.0.0 to 4.2.2 inclusive
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Verify file upload functionality exposureDetermine if the FileZen web interface or file upload endpoints are accessible from the network. Check firewall rules and service binding configuration.Affected if FileZen file upload functionality is accessible from untrusted networks
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Check for suspicious uploaded filesInspect directories outside the expected upload base path for unexpected files, particularly executable scripts or binaries in web-accessible directories.Affected if Unexpected files are found in directories outside the intended upload storage area
The environment is affected if FileZen version 3.0.0 through 4.2.2 is installed and its file upload interface is network-accessible.
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 · scopedUpgrade to FileZen version 4.2.3 or later. If immediate patching is not possible, implement network-level access controls to restrict exposure of the FileZen interface to untrusted networks.
FileZen version 4.2.3 or later
- Identify the current FileZen version installed in your environment
- Download FileZen version 4.2.3 or later from the official vendor website (www.soliton.co.jp)
- Review the upgrade documentation provided by Soliton Systems
- Perform the upgrade following the vendor's recommended upgrade procedure
- After upgrading, verify the new version is installed correctly
- Test that the path traversal vulnerability is no longer exploitable
- Ensure that file upload functionality works correctly in the updated version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-5639 — 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-2020-5639 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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