CVE-2021-34594: Beckhoff TF6100 Firmware

Medium severity, CVSS 6.5. EPSS: 1.1% chance of exploitation in the next 30 days.

TwinCAT OPC UA Server in TF6100 and TS6100 in product versions before 4.3.48.0 or with TcOpcUaServer versions below 3.2.0.194 are prone to a relative path traversal that allow administrators to create or delete any files on the system.

Affected products

• Beckhoff TF6100 Firmware: before 4.3.48.0 (fixed in 4.3.48.0)
• Beckhoff TS6100 Firmware: before 4.3.48.0 (fixed in 4.3.48.0)

Published 2021-11-04. Last modified 2026-06-17.