CVE-2019-5636

Beckhoff TwinCAT Discovery Service Denial of Service

State: Published
Severity: 5.3 Medium
Published: Nov 21, 2019
Updated: Sep 17, 2024
Reserved: Jan 7, 2019

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).

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	rapid7

Weaknesses

CWE-404 Improper Resource Shutdown or Release

Affected Products

Product	Versions
TwinCAT 2Beckhoff	2304 through 2304Affected
TwinCAT 3.1Beckhoff	4204.0 through 4204.0Affected

References

https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2019-004.pdf
https://blog.rapid7.com/2019/10/08/r7-2019-32-denial-of-service-vulnerabilities-in-beckhoff-twincat-plc-environment-fixed/

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.