# CVE-2019-5637

## Summary

- **CVE ID:** CVE-2019-5637
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-369
- **Published:** Nov 21, 2019
- **Last Modified:** Mar 14, 2026

## Description

When Beckhoff TwinCAT is configured to use the Profinet driver, a denial of service of the controller could be reached by sending a malformed UDP packet to the device. This issue affects TwinCAT 2 version 2304 (and prior) and TwinCAT 3.1 version 4204.0 (and prior).

## Affected Products

- Beckhoff — TwinCAT 2 (2304)
- Beckhoff — TwinCAT 3.1 (4204.0)

## References

- [CNA](https://blog.rapid7.com/2019/10/08/r7-2019-32-denial-of-service-vulnerabilities-in-beckhoff-twincat-plc-environment-fixed/)
- [CNA](https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2019-007.pdf)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.57%
- **EPSS Percentile:** 68.0

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