CVE-2019-5636

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).

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