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CVE-2019-5636

Beckhoff TwinCAT Discovery Service Denial of Service

HIGH
7.5
CVSS Score
Published: November 21, 2019 at 07:16 PM UTC
Updated: June 17, 2026 at 02:38 AM UTC
3 products affected across 1 vendorTwincatTwinCAT 3TwinCAT 2

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://blog.rapid7.com/2019/10/08/r7-2019-32-denial-of-service-vulnerabilities-in-beckhoff-twincat-plc-environment-fixed/
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2019-004.pdf

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-404

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