Vulnerability · Published May 13, 2021 · Assigned by CERTVDE
CVE-2020-12526BECKHOFF: DoS-Vulnerability for TwinCAT OPC UA Server and IPC Diagnostics UA Server
Medium 5.3
In plain English
A medium-severity improper input validation in IPC Diagnostics UA Server from Beckhoff. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Beckhoff | TwinCAT OPC UA Server | unspecified – through 2.3.0.12 |
| Beckhoff | IPC Diagnostics UA Server | unspecified – through 3.1.0.1 |
| Beckhoff | TF6100 | unspecified – through 3.3.18 |
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- https://cert.vde.com/en-us/advisories/vde-2020-051 x_refsource_CONFIRM
- https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2021-001.pdf x_refsource_CONFIRM