CVE-2025-3449: Weak Session Token used in Automation Runtime SDM

Severity: medium (CVSS 4.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-07 · updated 2026-10-08
Weakness: CWE-340

Description

A Generation of Predictable Numbers or Identifiers vulnerability in the SDM component of B&R Automation Runtime versions before 6.4 may allow an unauthenticated network-based attacker to take over already established sessions.

Affected products

B&R Industrial Automation GmbH Automation Runtime: from 6.0 before 6.4; 4 — fixed in 6.4

How to fix

Upgrade to a fixed version: B&R Industrial Automation GmbH Automation Runtime 6.4. Check the vendor advisory for mitigations.

References

https://www.br-automation.com/fileadmin/SA25P003-178b6a20.pdf

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