Medium severity5.3NVD Advisory· Published May 13, 2021· Updated Jun 17, 2026
CVE-2020-12526
CVE-2020-12526
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
8cpe:2.3:a:beckhoff:ipc_diagnostics_ua_server:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:beckhoff:ipc_diagnostics_ua_server:*:*:*:*:*:*:*:*range: <=3.1.0.1
- (no CPE)range: <=3.1.0.1
cpe:2.3:a:beckhoff:twincat_opc_ua_server:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:beckhoff:twincat_opc_ua_server:*:*:*:*:*:*:*:*range: <=2.3.0.12
- (no CPE)range: <=2.3.0.12
- (no CPE)range: unspecified
- Range: unspecified
- Beckhoff/TF6100v5Range: unspecified
Patches
Vulnerability mechanics
References
2- cert.vde.com/en-us/advisories/vde-2020-051nvdThird Party Advisory
- download.beckhoff.com/download/Document/product-security/Advisories/advisory-2021-001.pdfnvdVendor Advisory
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