CVE-2020-7830
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 · uneditedRAONWIZ v2018.0.2.50 and earlier versions contains a vulnerability that could allow remote files to be downloaded by lack of validation. Vulnerabilities in downloading with Kupload agent allow files to be downloaded to arbitrary paths due to insufficient verification of extensions and download paths. This issue affects: RAONWIZ RAON KUpload 2018.0.2.50 versions and earlier.
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 confidenceRAON KUpload 2018.0.2.50 and earlier contains an arbitrary file download vulnerability in its Kupload agent component. Insufficient validation of file extensions and download paths allows attackers to download files to arbitrary locations on the system, likely due to path traversal.
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<= 2018.0.2.50CVSS 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
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 RAON KUpload installationSearch for RAON KUpload files on the system. Common locations include web root directories (e.g., /www, /htdocs, /var/www) or application directories. Look for folders named 'Kuupload', 'kupload', or 'RAON' and check for DLL files such as Kupload.dll, KuploadAgent.dll, or configuration files like web.config that reference 'KuUpload' or 'Raonwiz'.Affected if RAON KUpload files are found on the system at any version.
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Identify installed versionCheck the version of the found Kupload DLL files. In Windows, right-click the DLL file, select Properties, and view the 'File version' or 'Product version' field. Alternatively, examine the assembly information if the DLL is a .NET assembly, or check any version.txt or version.info files in the installation directory.Affected if The version is 2018.0.2.50 or earlier.
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Verify Kupload agent component is exposedIdentify if the Kupload agent web endpoint is accessible. Common URL patterns include /Kupload/, /KuploadAgent/, /kupload/kuploadagent.aspx, or similar paths. Attempt to access these endpoints via HTTP GET request to confirm the component is exposed on the network.Affected if The Kupload agent endpoint responds to HTTP requests and accepts download parameters.
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Check if download functionality accepts user inputExamine the web application's download parameters. Look for query string parameters such as 'fileName', 'filePath', 'downloadFile', or similar that accept user-supplied file paths. Test whether the application accepts path traversal sequences like '../' in these parameters.Affected if The download feature accepts file path parameters without strict validation.
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Inspect file extension validationReview the Kupload agent configuration or code for file extension filtering. Check if there is any whitelist of allowed extensions or if the application relies solely on client-side validation. Attempt to request files with executable extensions (.asp, .aspx, .php, .exe) to see if they are downloaded or blocked.Affected if The application allows downloading files with arbitrary extensions or lacks server-side extension validation.
The environment is affected if RAON KUpload version 2018.0.2.50 or earlier is installed and the Kupload agent component is accessible with its download functionality exposed to users.
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.
From vendor dataRestrict download paths and implement strict validation of user-supplied file paths and extensions. If available, upgrade to a patched version of RAON KUpload.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2020-7830 — 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-2020-7830 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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