CVE-2019-5636
MEDIUMBeckhoff TwinCAT 2 < 2304 and TwinCAT 3.1 < 4204.0 - Denial of Service via Malformed UDP Packet
Title source: llmDescription
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).
References (2)
Core 2
Core References
Vendor Advisory x_refsource_confirm
https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2019-004.pdf
Exploit, Third Party Advisory x_refsource_misc
https://blog.rapid7.com/2019/10/08/r7-2019-32-denial-of-service-vulnerabilities-in-beckhoff-twincat-plc-environment-fixed/
Scores
CVSS v3
5.3
EPSS
0.0143
EPSS Percentile
69.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Details
CWE
CWE-404
Status
published
Products (2)
beckhoff/twincat
2.0 build2304
beckhoff/twincat
3.1 build4024.0
Published
Nov 21, 2019
Tracked Since
Feb 18, 2026