Vulnerability CVE-2019-5636
Published: 2019-11-21   Modified: 2019-11-24

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.

Type:

CWE-404

 (Improper Resource Shutdown or Release)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Beckhoff -> Twincat 

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