CVE-2025-9279
Published: 20 January 2026
Summary
CVE-2025-9279 is a high-severity Uncontrolled Resource Consumption (CWE-400) vulnerability in Rockwellautomation Armorstart Lt Firmware. Its CVSS base score is 8.7 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 40.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SC-5 (Denial-of-service Protection) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2025-9279 is a denial-of-service vulnerability affecting ArmorStart® LT devices from Rockwell Automation. The issue arises during execution of Achilles EtherNet/IP Step Limit Storm tests, causing the device to reboot unexpectedly and the Link State Monitor to go down for several seconds. It is classified under CWE-400 (Uncontrolled Resource Consumption) with a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating high severity due to its impact on availability.
The vulnerability can be exploited remotely over the network by unauthenticated attackers with low complexity and no user interaction required. By sending crafted traffic mimicking the Achilles EtherNet/IP Step Limit Storm tests, an attacker can trigger the device reboot, resulting in a temporary denial-of-service condition where the Link State Monitor is unavailable for several seconds. Repeated exploitation could disrupt industrial control system operations relying on the affected device.
Rockwell Automation has published security advisory SD1768 detailing the issue, available at https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1768.html. Security practitioners should consult this advisory for specific mitigation steps, patches, or workarounds applicable to ArmorStart® LT deployments.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-3429
Vulnerability details
A security issue exists within ArmorStart® LT that can result in a denial-of-service condition. During execution of the Achilles EtherNet/IP Step Limit Storm tests, the device reboots unexpectedly, causing the Link State Monitor to go down for several seconds.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The CVE describes remote exploitation of an uncontrolled resource consumption flaw (CWE-400) via crafted network traffic that forces device reboot, directly matching T1499.004 Application or System Exploitation for denial-of-service impact.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly implements denial-of-service protections to prevent resource exhaustion from crafted EtherNet/IP Step Limit Storm tests causing device reboots.
Requires timely flaw remediation, such as applying Rockwell Automation patches for the ArmorStart LT vulnerability per advisory SD1768.
Boundary protection filters and monitors network traffic to block or detect unauthenticated crafted EtherNet/IP packets exploiting the DoS condition.