What is CVE-2021-34594?

CVE-2021-34594 is a medium-severity vulnerability in Beckhoff Tf6100, classified under Relative Path Traversal. CVSS score: 6.5/10. Published 2021-11-04.

How severe is CVE-2021-34594?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Path Traversal in Beckhoff Tf6100

CVE-2021-34594

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.

Published 2021-11-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (65.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Beckhoff Tf6100
Beckhoff Tf6100 Firmware
Beckhoff Ts6100
Beckhoff Ts6100 Firmware
Beckhoff Automation Twincat Opc Ua Server — versions TF6100, TS6100, TcOpcUaServer version

Weakness classification (CWE)

References

cert.vde.com/en/advisories/VDE-2021-051/ (Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2021-34594?: CVE-2021-34594 is a medium-severity vulnerability in Beckhoff Tf6100, classified under Relative Path Traversal. CVSS score: 6.5/10. Published 2021-11-04.
How severe is CVE-2021-34594?: Medium severity. CVSS v3 base score is 6.5 out of 10.