Vulnerability Details CVE-2020-12526
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 58.5%
CVSS Severity
CVSS v3 Score 5.3
CVSS v2 Score 5.0
References
Products affected by CVE-2020-12526
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cpe:2.3:a:beckhoff:ipc_diagnostics_ua_server:-
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cpe:2.3:a:beckhoff:ipc_diagnostics_ua_server:3.1.0.1
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cpe:2.3:a:beckhoff:tf6100:-
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cpe:2.3:a:beckhoff:tf6100:3.3.18
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cpe:2.3:a:beckhoff:twincat_opc_ua_server:-
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cpe:2.3:a:beckhoff:twincat_opc_ua_server:2.3.0.12