What is the severity of CVE-2019-5636?

CVE-2019-5636 has a medium severity level associated with it, indicating it poses a risk of denial of service.

How do I fix CVE-2019-5636?

To fix CVE-2019-5636, you should update to TwinCAT 2 version 2304 or TwinCAT 3.1 version 4204.1 or later.

What impact does CVE-2019-5636 have on affected systems?

CVE-2019-5636 causes the ADS Discovery Service to shut down when a malformed UDP packet is received, but other TwinCAT functions continue to operate normally.

Which versions of TwinCAT are affected by CVE-2019-5636?

CVE-2019-5636 affects TwinCAT 2 version 2304 and all prior versions, as well as TwinCAT 3.1 version 4204.0 and all prior versions.

Is a workaround available for CVE-2019-5636?

There is no specific workaround for CVE-2019-5636, but updating to the patched versions is recommended to mitigate the vulnerability.

Vulnerability/
CVE-2019-5636

high

7.5

CWE

404

8/10/2019

4/8/2024

CVE-2019-5636: Beckhoff TwinCAT Discovery Service Denial of Service

First published: Tue Oct 08 2019(Updated: )

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).

Credit: cve@rapid7.con

Affected Software	Affected Version	How to fix
Beckhoff TwinCAT Extended Automation Runtime	=2.0-build2304
Beckhoff TwinCAT Extended Automation Runtime	=3.1-build4024.0

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Frequently Asked Questions

What is the severity of CVE-2019-5636?
CVE-2019-5636 has a medium severity level associated with it, indicating it poses a risk of denial of service.
How do I fix CVE-2019-5636?
To fix CVE-2019-5636, you should update to TwinCAT 2 version 2304 or TwinCAT 3.1 version 4204.1 or later.
What impact does CVE-2019-5636 have on affected systems?
CVE-2019-5636 causes the ADS Discovery Service to shut down when a malformed UDP packet is received, but other TwinCAT functions continue to operate normally.
Which versions of TwinCAT are affected by CVE-2019-5636?
CVE-2019-5636 affects TwinCAT 2 version 2304 and all prior versions, as well as TwinCAT 3.1 version 4204.0 and all prior versions.
Is a workaround available for CVE-2019-5636?
There is no specific workaround for CVE-2019-5636, but updating to the patched versions is recommended to mitigate the vulnerability.

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vendor/beckhoff
canonical/beckhoff twincat extended automation runtime
version/beckhoff twincat extended automation runtime/2.0-build2304
version/beckhoff twincat extended automation runtime/3.1-build4024.0

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