CVE-2021-43554
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 · uneditedFATEK WinProladder Versions 3.30_24518 and prior are vulnerable to an out-of-bounds write while processing 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 confidenceFATEK WinProladder versions 3.30_24518 and prior contain an out-of-bounds write vulnerability in the project file parsing logic. An attacker can craft a malicious project file that, when opened by a victim, triggers the memory corruption and allows arbitrary code execution.
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<= 3.30_24518CVSS 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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Check if WinProladder is installedSearch for WinProladder executable in common installation directories such as C:\Program Files\FATEK or C:\Program Files (x86)\FATEK, or check the Windows Programs and Features listAffected if WinProladder software is found on the system
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Identify the installed WinProladder versionOpen WinProladder and navigate to Help > About, or right-click the executable and select Properties > Details to view the file versionAffected if The version is 3.30_24518 or any version prior to it
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Verify project file handling is accessibleConfirm that the WinProladder application can open project files (typically .wpl or .wpp extensions) by checking if File > Open or similar options are availableAffected if Project file opening functionality exists and is accessible to the user
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Assess file access exposureCheck if the system has any WinProladder project files stored locally, or if users routinely receive project files from external sources via email, USB drives, or network sharesAffected if Project files from untrusted sources can be opened in WinProladder
The environment is affected if WinProladder version 3.30_24518 or earlier is installed and users can open project files, since the vulnerability is triggered during malicious project file parsing.
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 dataUntil an official vendor patch is released, implement compensating controls: restrict access to WinProladder, validate all project files before opening, deploy endpoint protection, and consider network isolation of engineering workstations.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-43554 — 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-2021-43554 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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