CVE-2025-9466

HighDDoS

Published: 20 January 2026

Published

20 January 2026

Modified

02 February 2026

KEV Added

—

Patch

—

CVSS Score v4 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Score 0.0057 42.7th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2025-9466 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 42.7th 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-2025-9466 is a vulnerability in ArmorStart® LT that can trigger a denial-of-service condition. The issue manifests during execution of Achilles EtherNet/IP and CIP grammar tests, causing the device to reboot unexpectedly and the Link State Monitor to go offline for several seconds. It carries 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) and is linked to CWE-400 (Uncontrolled Resource Consumption).

A remote, unauthenticated attacker can exploit this vulnerability over the network with low attack complexity and no user interaction required. Exploitation results in a temporary denial of service, as the targeted device reboots and its Link State Monitor becomes unavailable for several seconds.

Rockwell Automation's security advisory (SD1768) at https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1768.html provides details on mitigation steps for this vulnerability.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-3435

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 and CIP grammar tests, the device reboots unexpectedly, causing the Link State Monitor to go down for several seconds.

CWE(s): CWE-400

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1499.004 Application or System Exploitation Impact

Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.

attack.mitre.org →

Why these techniques?

Remote unauthenticated exploitation of uncontrolled resource consumption (CWE-400) directly triggers device reboot and temporary service unavailability, matching Application or System Exploitation for Endpoint DoS.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0