CVE-2021-27486
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 Automation WinProladder Versions 3.30 and prior is vulnerable to an integer underflow, which may cause an out-of-bounds write and 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 Automation WinProladder versions 3.30 and prior contain an integer underflow vulnerability in data processing that leads to an out-of-bounds memory write, allowing an attacker to achieve arbitrary code execution via specially crafted input files or network packets.
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<= 3.30CVSS 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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Locate WinProladder installationSearch for WinProladder executable or installation directory on the system. Common locations include C:\Program Files\FATEK or C:\Program Files (x86)\FATEK, or check the application's executable file properties.Affected if WinProladder is found installed on the system
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Determine installed versionRight-click the WinProladder executable (typically WinProladder.exe) and select Properties, then check the Details tab for the Version or File Version field.Affected if The version listed is 3.30 or any version number lower than 3.30 (for example, 3.20, 3.10, 3.00, etc.)
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Identify project filesLook for .lad or other project file types that WinProladder uses in working directories. These files are loaded by the application and could contain specially crafted malicious input.Affected if Project files (.lad or proprietary formats) exist and can be loaded by WinProladder, indicating the application processes external input
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Check network exposureReview network configuration and firewall rules to determine if the system running WinProladder is accessible from untrusted networks. WinProladder may listen on network ports for communication with PLC devices.Affected if The system has open network listeners or is accessible from untrusted networks without proper segmentation
The environment is affected if WinProladder version 3.30 or lower is installed and the application loads external project files or accepts network communication from untrusted sources.
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 dataApply vendor-supplied patches when available; until then, restrict network access to systems running WinProladder, validate input files before loading, and deploy the software on isolated workstations with restricted privileges to limit exploitation impact.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 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 $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-27486 — 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-2021-27486 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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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.
- 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