CVE-2020-12526mediumCWE-20

CVE-2020-12526: medium-severity vulnerability in Beckhoff TwinCAT OPC UA Server

BECKHOFF: DoS-Vulnerability for TwinCAT OPC UA Server and IPC Diagnostics UA Server

Published 13 May 2021 · Updated 16 Sep 2024

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.3epss 1.0%

TwinCAT OPC UA Server in versions up to 2.3.0.12 and IPC Diagnostics UA Server in versions up to 3.1.0.1 from Beckhoff Automation GmbH & Co. KG are vulnerable to denial of service attacks. The attacker needs to send several specifically crafted requests to the running OPC UA server. After some of these requests the OPC UA server is no longer responsive to any client. This is without effect to the real-time functionality of IPCs.

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

Affected products

Beckhoff · IPC Diagnostics UA Server Beckhoff · TF6100 Beckhoff · TwinCAT OPC UA Server

References

https://cert.vde.com/en-us/advisories/vde-2020-051 https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2021-001.pdf