CVE-2020-10646
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 · uneditedFuji Electric V-Server Lite all versions prior to 4.0.9.0 contains a heap based buffer overflow. The buffer allocated to read data, when parsing VPR files, is too small.
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 confidenceFuji Electric V-Server Lite versions prior to 4.0.9.0 contain a heap-based buffer overflow vulnerability. When parsing VPR files, the application allocates a buffer that is too small to hold the incoming data, leading to heap memory corruption when the data is read into the undersized buffer.
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< 4.0.9.0CVSS 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
- 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 V-Server Lite installationCheck for Fuji Electric V-Server Lite in the system registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall or look for the application in Add/Remove Programs. Also check common installation directories such as C:\Program Files\Fuji Electric or C:\Program Files (x86)\Fuji Electric.Affected if The software is present on the system
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Identify installed versionLocate the V-Server Lite executable (typically named V-Server.exe or similar) and check its version property through right-click > Properties > Details, or use the command: wmic datafile where "name='C:\Program Files\Fuji Electric\V-Server\V-Server.exe'" get VersionAffected if The reported version is lower than 4.0.9.0 or the version cannot be determined or is not displayed
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Determine if VPR file parsing feature is usedSearch the system for .vpr files which indicate the vulnerable parsing feature is in use. Check the application configuration files or user documents for VPR file associations or recent file access history.Affected if VPR files exist on the system or the application has been used to open VPR files
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Verify network exposureReview network configuration and firewall rules to determine if the system running V-Server Lite is accessible from untrusted networks or if it accepts VPR files from external sources.Affected if The system is network-accessible and VPR files from untrusted sources can reach the application
The environment is affected if Fuji Electric V-Server Lite is installed with a version lower than 4.0.9.0 and the system processes VPR files from any source.
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 data4.0.9.0
Upgrade V-Server Lite to version 4.0.9.0 or later to obtain the patched build. If immediate patching is not feasible, restrict access to VPR files from untrusted sources and network isolate affected systems.
- 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-2020-10646 — 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-2020-10646 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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