CVE-2021-34594

Beckhoff: Relative path traversal vulnerability through TwinCAT OPC UA Server

MEDIUM

6.5

CVSS Score

Published: November 4, 2021 at 09:50 AM UTC

Updated: June 17, 2026 at 03:56 AM UTC

5 products affected across 2 vendorsTS6100 FirmwareTF6100 FirmwareTF6100

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Severity

MEDIUM6.5

Exploit prediction

EPSS 1%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

TF6100 Firmware · Beckhoff

95%

v < 4.3.48.0

Affected range stops below 4.3.48.0, so it looks safe — our inference, not a vendor statement

beckhoff-tf6100 (same device)

TS6100 Firmware · Beckhoff

95%

v < 4.3.48.0

Affected range stops below 4.3.48.0, so it looks safe — our inference, not a vendor statement

beckhoff-ts6100 (same device)

TwinCAT OPC UA Server · Beckhoff Automation

60%

TF6100 ≤ v < 4.3.48.0TS6100 ≤ v < 4.3.48.0TcOpcUaServer version ≤ v < 3.2.0.19423TF6100 TS6100 TcOpcUaServer version

Affected range stops below 3.2.0.19423, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.3.48.0, so it looks safe — our inference, not a vendor statement

TF6100 · Beckhoffdevice

80%

All versions

Ts6100 · Beckhoffdevice

80%

All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://cert.vde.com/en/advisories/VDE-2021-051/

References (1)

x_refsource_CONFIRMMitigationThird Party Advisory

Source: [email protected]

https://cert.vde.com/en/advisories/VDE-2021-051/

CVSS

6.5MEDIUMCERTVDE

Attack Vector: NETWORK
Complexity: LOW
Privileges: HIGH
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-23CWE-22

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