# CVE-2021-43934: Elcomplus SmartPtt Unrestricted Upload of File with Dangerous Type

> Attackers can upload arbitrary files via the backup and restore system, potentially leading to remote code execution on the SmartPTT server.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Apr 2022
- **Updated:** 16 Apr 2025
- **Also known as:** GHSA-jq86-54q5-fmjr

## What is CVE-2021-43934?

CVE-2021-43934 is a critical vulnerability in Elcomplus SmartPTT, published on 28 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Elcomplus SmartPTT is vulnerable as the backup and restore system does not adequately validate upload requests, enabling a malicious user to potentially upload arbitrary files.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2021-43934?

It affects 1 product.


Products: Smartptt Smartptt Scada.

## How do I fix CVE-2021-43934?

No fix has been published for CVE-2021-43934 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-43934 being exploited?

There is no known exploitation of CVE-2021-43934 in the wild and no public exploit code.

## Other vulnerabilities in Elcomplus SmartPTT

- [CVE-2021-43932](https://insights.sbomify.com/CVE-2021-43932/): Elcomplus SmartPtt Cross-site Scripting (critical 9.0)
- [CVE-2021-43939](https://insights.sbomify.com/CVE-2021-43939/): Elcomplus SmartPtt Improper Authorization (high 8.8)
- [CVE-2023-30459](https://insights.sbomify.com/CVE-2023-30459/): Code injection in n/a (high 7.2)
- [CVE-2021-43930](https://insights.sbomify.com/CVE-2021-43930/): Elcomplus SmartPtt Path Traversal (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-43934 and fix it if it is affected.

What it is: CVE-2021-43934 is a critical vulnerability in Elcomplus SmartPTT, published on 28 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-43934 in the wild and no public exploit code.

Affected product: Elcomplus SmartPTT. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-43934/ (Markdown: https://insights.sbomify.com/CVE-2021-43934/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-43934
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-43934
- OSV: https://osv.dev/vulnerability/CVE-2021-43934

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-43934/
Summaries are generated and may contain mistakes; the official description above is the record.