CVE-2023-31239
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 · uneditedStack-based buffer overflow vulnerability in V-Server v4.0.15.0 and V-Server Lite v4.0.15.0 and earlier allows an attacker to execute arbitrary code by having user open a specially crafted VPR file.
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 confidenceStack-based buffer overflow in Yamasoft V-Server and V-Server Lite versions 4.0.15.0 and earlier allows arbitrary code execution when a user opens a specially crafted VPR file. The vulnerability stems from insufficient bounds checking during VPR file parsing, enabling an attacker to overwrite stack memory and redirect execution flow.
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= 4.0.15.0CVSS 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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Identify if Fujielectric V Server is installedCheck the system for Fujielectric V Server installation by looking in standard program directories (C:\Program Files\Fujielectric\V Server or similar) or use the Windows Programs and Features control panel to search for 'V Server' or 'V-Server'Affected if Fujielectric V Server software is present on the system
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Determine installed version numberRight-click the V Server executable (typically named VServer.exe or similar) in the installation directory, select Properties, and check the Details tab for the File Version. Alternatively, check the version in Programs and Features.Affected if The installed version is 4.0.15.0 or earlier
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Verify VPR file association existsCheck if .vpr file extension is associated with V Server by opening Command Prompt and running 'assoc .vpr' or checking the Windows Default Apps settings for .vpr file typeAffected if The .vpr file extension is associated with Fujielectric V Server
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Check for recent VPR file handlingInspect the Windows Prefetch folder, recent documents, or application event logs for evidence of .vpr files being opened by V Server. Check browser download history and user recent files for any VPR file access.Affected if Any .vpr files have been opened using V Server on this system
A system is affected if Fujielectric V Server version 4.0.15.0 or earlier is installed and configured to handle .vpr files.
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 dataAvoid opening VPR files from untrusted sources; await vendor patch; implement application whitelisting or disable VPR file association until patched version is available.
- Consultation2.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,408.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-31239 — 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-2023-31239 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