Vulnerability identifier: #VU34950

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-16871

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
TwinCAT
Client/Desktop applications / Software for system administration

Vendor: Beckhoff

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

Beckhoff Embedded Windows PLCs through 3.1.4024.0, and Beckhoff Twincat on Windows Engineering stations, allow an attacker to achieve Remote Code Execution (as SYSTEM) via the Beckhoff ADS protocol.

Mitigation
Install update from vendor's website.

Vulnerable software versions

TwinCAT: 2.0 - 3.1

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External links
http://download.beckhoff.com/download/document/product-security/Advisories/advisory-2017-001.pdf
http://www.ic4.be/2019/12/18/beckhoff-cve-2019-16871/#more-648

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.