Vulnerability Monitor

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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.

Published

2021-05-13T14:15:17.457

Last Modified

2024-11-21T04:59:52.260

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.3 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Secondary
CWE-20
Type: Primary
CWE-20

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	beckhoff	ipc_diagnostics_ua_server	≤ 3.1.0.1	Yes
Application	beckhoff	tf6100	≤ 3.3.18	Yes
Application	beckhoff	twincat_opc_ua_server	≤ 2.3.0.12	Yes

References

https://cert.vde.com/en-us/advisories/vde-2020-051 Third Party Advisory ([email protected])
https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2021-001.pdf Vendor Advisory ([email protected])
https://cert.vde.com/en-us/advisories/vde-2020-051 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2021-001.pdf Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)