Unrated severityNVD Advisory· Published Nov 21, 2019· Updated Sep 17, 2024

Beckhoff TwinCAT Discovery Service Denial of Service

CVE-2019-5636

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 products

Beckhoff/Twincatllm-fuzzy3 versions
<=2304+ 2 more
- (no CPE)range: <=2304
- (no CPE)range: 2304
- (no CPE)range: 4204.0

Patches

Vulnerability mechanics

References

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

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