CVE-2025-9466 ArmorStart® LT - Multiple Denial-of-Service Vulnerabilities
An attacker can cause unexpected device reboots and link state monitor downtime in ArmorStart LT devices via specific EtherNet/IP and CIP grammar tests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-9466?
CVE-2025-9466 is a high-severity denial of service vulnerability in Rockwell Automation ArmorStart® LT, published on 20 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-400
Which versions are affected by CVE-2025-9466?
It affects 1 product.
Products include Rockwellautomation Armorstart Lt Firmware.
How do I fix CVE-2025-9466?
No fix has been published for CVE-2025-9466 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-9466 being exploited?
There is no known exploitation of CVE-2025-9466 in the wild and no public exploit code.
Other vulnerabilities in Rockwell Automation ArmorStart® LT
- CVE-2025-9278 ArmorStart® LT - Multiple Denial-of-Service Vulnerabilities
- CVE-2025-9279 ArmorStart® LT - Multiple Denial-of-Service Vulnerabilities
- CVE-2025-9280 ArmorStart® LT - Multiple Denial-of-Service Vulnerabilities
- CVE-2025-9281 ArmorStart® LT - Multiple Denial-of-Service Vulnerabilities
- CVE-2025-9282 ArmorStart® LT - Multiple Denial-of-Service Vulnerabilities
Sources
Also known as GHSA-48fj-rpwg-8hjq.