# CVE-2023-3663

## Summary

- **CVE ID:** CVE-2023-3663
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
- **CWE:** CWE-940
- **Published:** Aug 3, 2023
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- CODESYS — CODESYS Development System (3.5.11.20)

## References

- [CNA](https://cert.vde.com/en/advisories/VDE-2023-022/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.66%
- **EPSS Percentile:** 70.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._