Beckhoff: Relative path traversal vulnerability through TwinCAT OPC UA Server
Priority LOW 31CWE-23Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.01126 66th percentileScored 2026-11-08
Fix Fixed TwinCAT OPC UA Server (Beckhoff Automation): 4.3.48.0, 3.2.0.19423
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Beckhoff Automation | TwinCAT OPC UA Server | TF6100 to before 4.3.48.0; TS6100 to before 4.3.48.0; TcOpcUaServer version to before 3.2.0.19423 | 4.3.48.0, 3.2.0.19423 | Patch available | CNA |
- TwinCAT OPC UA Server VendorBeckhoff Automation Affected TF6100 to before 4.3.48.0; TS6100 to before 4.3.48.0; TcOpcUaServer version to before 3.2.0.19423 Fixed in 4.3.48.0, 3.2.0.19423 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:beckhoff:tf6100_firmware:*:*:*:*:*:*:*:* | before 4.3.48.0 | Vulnerable | Beckhoff |
| cpe:2.3:h:beckhoff:tf6100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Beckhoff |
| cpe:2.3:o:beckhoff:ts6100_firmware:*:*:*:*:*:*:*:* | before 4.3.48.0 | Vulnerable | Beckhoff |
| cpe:2.3:h:beckhoff:ts6100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Beckhoff |
- cpe:2.3:o:beckhoff:tf6100_firmware:*:*:*:*:*:*:*:* Versions before 4.3.48.0 Vulnerable ·Beckhoff
- cpe:2.3:h:beckhoff:tf6100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Beckhoff
- cpe:2.3:o:beckhoff:ts6100_firmware:*:*:*:*:*:*:*:* Versions before 4.3.48.0 Vulnerable ·Beckhoff
- cpe:2.3:h:beckhoff:ts6100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Beckhoff
Remediation
- Fix · CNA TwinCAT OPC UA Server (Beckhoff Automation) Fixed in 4.3.48.0, 3.2.0.19423
Timeline
- 2026-10-02 Threatist record created from CVE-2021-34594
- 2026-10-03 Alias added: GHSA-pjgx-r654-8vfq
References
More Beckhoff Automation vulnerabilities
- TI-2025-27690 Beckhoff: Information leak via Beckhoff Device Manager CVSS 3.1MEDIUM 5.3
- TI-2025-27688 Beckhoff: Arbitrary code execution within privileged processes CVSS 3.1HIGH 8.8
- TI-2025-27689 Beckhoff: Performing privileged operations and gaining administrator access CVSS 3.1HIGH 7.8
- TI-2025-27728 Beckhoff: XSS Vulnerability in TwinCAT 3 HMI Server CVSS 3.1MEDIUM 5.5
Sources
- CVE-2021-34594 · CVE Program
- CVE-2021-34594 · NVD
- FIRST EPSS
- GHSA-pjgx-r654-8vfq · GitHub Advisory Database · CC BY 4.0
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