CVE-2019-5636 — MEDIUM (5.3)

Vulnerability 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).

CVSS Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

LOW

Affected Products

Vendor	Product	Versions
Beckhoff	Twincat	2.0

Related Weaknesses (CWE)

CWE-404

References

https://blog.rapid7.com/2019/10/08/r7-2019-32-denial-of-service-vulnerabilities-ExploitThird Party Advisory
https://download.beckhoff.com/download/Document/product-security/Advisories/adviVendor Advisory
https://blog.rapid7.com/2019/10/08/r7-2019-32-denial-of-service-vulnerabilities-ExploitThird Party Advisory
https://download.beckhoff.com/download/Document/product-security/Advisories/adviVendor Advisory

FAQ

What is CVE-2019-5636?

CVE-2019-5636 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 versio...

How severe is CVE-2019-5636?

CVE-2019-5636 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2019-5636?

Check the references section above for vendor advisories and patch information. Affected products include: Beckhoff Twincat.