# ABB B&R Automation Runtime DoS via SDM component

Published: 2026-05-26 · Severity: routine · Sectors: energy, manufacturing, healthcare, infrastructure, government-national, telecommunications, financial-services
Canonical: https://vorant.io/reports/dcb4f630-b8a5-52f2-b46d-633d23206494/abb-b-r-automation-runtime-dos-via-sdm-component

> Improper resource locking in B&R Automation Runtime System Diagnostics Manager allows unauthenticated network DoS; patches available.

ABB's Product Security Incident Response Team has disclosed CVE-2025-3450, an improper resource locking vulnerability in the System Diagnostics Manager (SDM) component of B&R Automation Runtime affecting versions before 6.3 and before Q4.93. An unauthenticated network-based attacker with access to an affected system's network can craft and send a specially crafted message to trigger data deletion and cause the controller to stop, resulting in denial of service. The SDM is a web-accessible diagnostic interface exposed over the Automation Runtime webserver.

The vulnerability requires network access to the affected system but does not require authentication. ABB states the SDM is disabled by default in Automation Runtime 6.0 and later, limiting exposure for newer deployments. Organizations running affected versions with SDM enabled—particularly in chemical, energy, manufacturing, critical infrastructure, healthcare, water/wastewater, and communications sectors—should prioritize patching to version 6.3 or Q4.93. At the time of disclosure, there were no reports of active exploitation or public disclosure; however, the remote exploitability and denial-of-service impact make this a concern for production control systems.

## Mentioned in this report

- Vulnerabilities: CVE-2025-3450

Source reporting: https://www.cisa.gov/news-events/ics-advisories/icsa-26-146-04

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