CVE-2020-12526

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

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

TwinCAT OPC UA Server en versiones hasta 2.3.0.12 e IPC Diagnostics UA Server en versiones hasta 3.1.0.1 de Beckhoff Automation GmbH & Co. KG son vulnerables a ataques de denegación de servicio. El atacante necesita enviar varias peticiones diseñadas específicamente al servidor OPC UA en ejecución. Después de algunas de estas peticiones, el servidor OPC UA ya no responde a ningún cliente. Esto no afecta a la funcionalidad en tiempo real de los IPC

*Credits: Beckhoff Automation thanks Industrial Control Security Laboratory of QI-ANXIN Technology Group Inc. from China for reporting the issue and for support and efforts with the coordinated disclosure. Also Beckhoff Automation thanks CERT@VDE for coordination.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-04-30 CVE Reserved
2021-05-13 CVE Published
2024-09-16 CVE Updated
2024-12-17 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (2)

URL	Tag	Source
https://cert.vde.com/en-us/advisories/vde-2020-051	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2021-001.pdf	2021-05-25

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Beckhoff Search vendor "Beckhoff"		Ipc Diagnostics Ua Server Search vendor "Beckhoff" for product "Ipc Diagnostics Ua Server"				<= 3.1.0.1 Search vendor "Beckhoff" for product "Ipc Diagnostics Ua Server" and version " <= 3.1.0.1"		-		Affected
Beckhoff Search vendor "Beckhoff"		Tf6100 Search vendor "Beckhoff" for product "Tf6100"				<= 3.3.18 Search vendor "Beckhoff" for product "Tf6100" and version " <= 3.3.18"		-		Affected
Beckhoff Search vendor "Beckhoff"		Twincat Opc Ua Server Search vendor "Beckhoff" for product "Twincat Opc Ua Server"				<= 2.3.0.12 Search vendor "Beckhoff" for product "Twincat Opc Ua Server" and version " <= 2.3.0.12"		-		Affected