CVE-2025-11043 PUBLISHED

Improper Server Certificate Validation in Automation Studio

Assigner: ABB
Reserved: 26.09.2025 Published: 19.01.2026 Updated: 20.01.2026

An Improper Certificate Validation vulnerability in the OPC-UA client and ANSL over TLS client used in Automation Studio versions before 6.5 could allow an unauthenticated attacker on the network to position themselves to intercept and interfere with data exchanges.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score: 9.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS Score: 7.4

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	B&R Industrial Automation GmbH
Product	B&R Automation Studio
Versions	Default: unaffected Version 4 is affected affected from 6 to 6.5 (excl.)

References

https://www.br-automation.com/fileadmin/SA25P004-4f45197f.pdf

Problem Types

CWE-295 Improper Certificate Validation CWE