CVE-2020-12526
Medium
Description
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductBeckhoff Twincat Opc Ua Server
PublishedMay 13, 2021
First seenMay 13, 2021
Weakness typeCWE-20Improper input validation
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| beckhoff twincat_opc_ua_server | v ≤ 2.3.0.12 | — |
| beckhoff ipc_diagnostics_ua_server | v ≤ 3.1.0.1 | — |
| beckhoff tf6100 | v ≤ 3.3.18 | — |
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