CVE-2021-43934
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 · uneditedElcomplus SmartPTT is vulnerable as the backup and restore system does not adequately validate upload requests, enabling a malicious user to potentially upload arbitrary files.
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 confidenceElcomplus SmartPTT contains an arbitrary file upload vulnerability in its backup and restore functionality. The system fails to adequately validate upload requests, allowing a malicious user to upload arbitrary files to the server. This could enable remote code execution if an attacker uploads a malicious payload (e.g., web shell) to a location accessible via the web server.
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= 1.1CVSS 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 SmartPTT SCADA installation and versionLocate the SmartPTT SCADA installation directory and check the version information, typically found in application metadata files, about dialog, or version.ini within the program folderAffected if The installed version is exactly 1.1
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Verify backup/restore functionality is accessibleIdentify whether the backup and restore feature is enabled and accessible. This may involve checking the web interface for backup/restore endpoints, configuration files that enable this feature, or access control settingsAffected if The backup/restore functionality is enabled and exposed
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Inspect web-accessible directoriesReview the web server configuration to determine which directories are served publicly. Check if any upload directories (commonly /uploads/, /backup/, /temp/) are within the web root and accessible via HTTP/HTTPSAffected if Uploaded files can be served from web-accessible directories, enabling remote code execution
You are affected if SmartPTT SCADA version 1.1 is running with the backup/restore feature enabled and files can be uploaded to web-accessible directories.
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 dataImplement strict file validation on backup/restore uploads including: file type allowlist, file content magic bytes verification, filename sanitization, proper authentication/authorization checks, and storing uploads outside web-accessible directories.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-43934 — 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-2021-43934 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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