CVE-2019-5636

Published: Nov 21, 2019Modified: Jun 17, 2026

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: NVD

Description

When a Beckhoff TwinCAT Runtime receives a malformed UDP packet, the ADS Discovery Service shuts down. Note that the TwinCAT devices are still performing as normal. This issue affects TwinCAT 2 version 2304 (and prior) and TwinCAT 3.1 version 4204.0 (and prior).

Affected (2)

Products: Beckhoff: Twincat

1 product

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Beckhoff Twincat	Version 2.0 build2304
Beckhoff Twincat	Version 3.1 build4024.0

Related CWEs

Improper Resource Shutdown or Release

The product does not release or incorrectly releases a resource before it is made available for re-use.

References (4)

https://blog.rapid7.com/2019/10/08/r7-2019-32-denial-of-service-vulnerabilities-in-beckhoff-twincat-plc-environment-fixed/

Source: cve@rapid7.com

ExploitThird Party Advisory

https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2019-004.pdf

Source: cve@rapid7.com

Vendor Advisory

https://blog.rapid7.com/2019/10/08/r7-2019-32-denial-of-service-vulnerabilities-in-beckhoff-twincat-plc-environment-fixed/

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitThird Party Advisory

https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2019-004.pdf

Source: af854a3a-2127-422b-91ae-364da2661108

Vendor Advisory

Timeline

No history available yet.