What’s Vulnerable › Vulnerabilities
CVE-2021-34594: Beckhoff: Relative path traversal vulnerability through TwinCAT OPC UA Server
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-11-04 · updated 2026-06-17
- Weakness: CWE-23
Description
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
How to fix
Upgrade to a fixed version: Beckhoff Tf6100 Firmware 4.3.48.0; Beckhoff Ts6100 Firmware 4.3.48.0. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2021-34594 or the next vulnerability affects your stack