Automation Runtime: Improper Resource Locking
CVE-2025-3450 is a critical-severity improper resource locking vulnerability in Automation Runtime from B&R Industrial Automation, with a CVSS 3.1 base score of 10.0 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 6.3, Q4.93 as the first without the flaw, so updating Automation Runtime to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.28% chance of exploitation within 30 days, which is low compared with other CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update Automation Runtime to 6.3 or Q4.93, whichever matches your release line, or a later version.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| B&R Industrial Automation | Automation Runtime | 6.0 up to, but not including, 6.3; 4.0 up to, but not including, Q4.93 | 6.3, Q4.93 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H. Scored by CNA (ch.abb.com).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 9.3 | Critical | CNA (ch.abb.com) |
| CVSS 3.1 | 10.0 | Critical | CNA (ch.abb.com) |
Official description
An Improper Resource Locking vulnerability in the SDM component of B&R Automation Runtime versions before 6.3 and before Q4.93 may allow an unauthenticated network-based attacker to delete data causing denial of service conditions.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Resource Locking
The product must have exclusive access to a resource, but it does not lock or does not correctly lock that resource.
How developers prevent this class of flaw
- Use synchronization when locking a resource.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other references
Other vulnerabilities in Automation Runtime
- 7.5 High severity
- 7.5 High severity
- 7.2 High severity
- 9.8 Critical severity
Recent Improper Resource Locking vulnerabilities
- 7.7 High severity
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