# CVE-2025-11043: ABB B&R Automation Studio

Source: https://junglewise.ai/threats/cve-2025-11043-abb-b-amp-r-automation-studio  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-05. Updated: 2026-05-14  
License: CC BY 4.0 with a link back

CVE-2025-11043 · Severity: high · CVSS 7.4 · Published 2026-05-05

ABB B&R Automation Studio is a development environment used to create and manage industrial automation systems. A security flaw in how the software verifies digital certificates could allow an attacker to impersonate a trusted server. If exploited, this could lead to the theft of sensitive configuration data or the unauthorized modification of automation instructions, potentially disrupting manufacturing operations.

Vendors: [B&R Industrial Automation](https://junglewise.ai/threats/vendors/b-r-industrial-automation).

## Quick answers

**Is CVE-2025-11043 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-11043 being exploited in the wild.

**How severe is CVE-2025-11043?** High severity, with a CVSS score of 7.4, published 5 May 2026.

**Which products and versions are affected?** B&R Industrial Automation Automation Studio < 6.5.

**Is there a fix for CVE-2025-11043?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2025-11043 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-11043?** Check whether you run B&R Industrial Automation Automation Studio at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An Improper Certificate Validation vulnerability (CWE-295) exists in the OPC-UA and ANSL over TLS client implementations within ABB B&R Automation Studio. The root cause is insufficient validation mechanisms for server certificates during the establishment of secure connections. An unauthenticated attacker with network access can exploit this by redirecting traffic (via DNS poisoning or routing manipulation) and presenting a specially crafted certificate. Successful exploitation enables Man-in-the-Middle (MitM) attacks, allowing the interception or alteration of data exchanged between the development environment and industrial controllers. The vulnerability is resolved in B&R Automation Studio version 6.5.

## Affected products

- ABB B&R Automation Studio < 6.5

## Timeline

- 2025-11-04: other: CVE ID assigned year prefix
- 2026-05-05: advisory: CISA and ABB published the advisory

## References

- [https://www.cisa.gov/news-events/ics-advisories/icsa-26-125-04](https://www.cisa.gov/news-events/ics-advisories/icsa-26-125-04)

## Related threats

- [SQLite memory corruption via aggregate term overflow](https://junglewise.ai/threats/cve-2025-6965-sqlite-memory-corruption-via-aggregate-term-overflow)