CVE-2020-12526— BECKHOFF: DoS-Vulnerability for TwinCAT OPC UA Server and IPC Diagnostics UA Server
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I. Basic Information for CVE-2020-12526
Vulnerability Information
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Vulnerability Title
BECKHOFF: DoS-Vulnerability for TwinCAT OPC UA Server and IPC Diagnostics UA Server
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Honeywell OPC UA Tunneller 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Honeywell OPC UA Tunneller是美国Honeywell公司的一个可为跨设备、跨域之间提供可靠OPC UA连接的应用软件 Honeywell OPC UA Tunneller 存在安全漏洞。攻击者可以利用该漏洞使程序拒绝服务。以下产品及版本受到影响：TwinCAT OPC UA Server in versions up to 2.3.0.12 and IPC Diagnostics UA Server in versions up to 3.1.0。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Beckhoff | TwinCAT OPC UA Server | unspecified ~ 2.3.0.12 | - | |
| Beckhoff | IPC Diagnostics UA Server | unspecified ~ 3.1.0.1 | - | |
| Beckhoff | TF6100 | unspecified ~ 3.3.18 | - |
II. Public POCs for CVE-2020-12526
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|---|
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- Advisoriesx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2020-12526
IV. Related Vulnerabilities
Same vendor: Beckhoff
- CVE-2025-41701
Beckhoff: Deserialization of untrusted data by TwinCAT 3 Eng - CVE-2024-8934
Beckhoff: Local command injection via TwinCAT Package Manage - CVE-2024-41176
Beckhoff: Local Denial of Service issue in package MDP inclu - CVE-2024-41175
Beckhoff: Local Denial-of-Service vulnerability in TwinCAT/B - CVE-2024-41174
Beckhoff: Improper input neutralization vulnerability in the
Same weakness: CWE-20
V. Comments for CVE-2020-12526
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