dbcve.org
LevistudiouApplication · We Con

CVE-2021-43983

HIGH · 7.8 CVSS v3.1 Published 2021-12-13
Fix available
A fix is available. Upgrade to after 2019-09-21 or later.
See remediation →
81/100
Remediation priority · High
No privileges

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 · unedited
WECON LeviStudioU Versions 2019-09-21 and prior are vulnerable to multiple stack-based buffer overflow instances while parsing project files, which may allow an attacker to execute arbitrary code.

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 confidence

WECON LeviStudioU versions 2019-09-21 and prior contain multiple stack-based buffer overflow vulnerabilities in project file parsing routines. When parsing malformed project files, the software fails to properly validate input bounds before copying data to fixed-size stack buffers, allowing controlled overflow that can corrupt return addresses and enable arbitrary code execution.

MitigationUpgrade LeviStudioU to a version newer than 2019-09-21. If upgrade is not immediately possible, restrict handling of project files to trusted sources only and run the software in sandboxed or isolated environments to limit exploitation impact.

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
LevistudiouApplication
Affected:<= 2019-09-21

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Locate LeviStudioU installation
    Search for LeviStudioU executable (typically named LeviStudioU.exe) in common program directories such as C:\Program Files\WECON\ or C:\Program Files (x86)\WECON\, or use the Windows search function to find the installation directory.
    Affected if The software is installed on the system.
  2. Determine installed version
    Right-click on the LeviStudioU.exe file, select Properties, and view the Version tab to obtain the file version and product version. Alternatively, check Add/Remove Programs or Programs and Features for the installed version information.
    Affected if The displayed version is 2019-09-21 or any version dated prior to 2019-09-21.
  3. Check for project file handling
    Examine the LeviStudioU installation directory for project file extensions (such as .lup, .levi, or proprietary project file formats typically used by HMI development tools). Determine whether the software is configured to open or parse project files from any directory.
    Affected if The software is used to open, create, or parse project files from any source.
  4. Review execution context
    Identify whether LeviStudioU is run with elevated privileges or has access to sensitive system resources. Check if it is accessible from network shares or if untrusted users can supply project files to the software.
    Affected if LeviStudioU runs with administrative privileges or accepts project files from untrusted or network locations.

A system is affected if LeviStudioU version 2019-09-21 or prior is installed and the software is used to handle project files, particularly from untrusted sources.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Upgrade available Upgrade to a release after 2019-09-21
Interim mitigation

Upgrade LeviStudioU to a version newer than 2019-09-21. If upgrade is not immediately possible, restrict handling of project files to trusted sources only and run the software in sandboxed or isolated environments to limit exploitation impact.

Fix this in Levistudiou Scoped from the published advisory
  • Consultation10.0 h
  • Implementation20.0 h
  • Testing12.0 h
  • Review / QA6.0 h
48.0 hours of engineering $8,480
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $13,568.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2021-43983 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-43983 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

What this is

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.

What belongs here
  • 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