# 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.

- **Severity:** High 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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Jan 2026
- **Updated:** 20 Jan 2026
- **Also known as:** GHSA-48fj-rpwg-8hjq

## 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 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2025-9466?

It affects 1 product.


Products: 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.

## 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](https://insights.sbomify.com/CVE-2025-9278/): ArmorStart® LT - Multiple Denial-of-Service Vulnerabilities (high 8.7)
- [CVE-2025-9279](https://insights.sbomify.com/CVE-2025-9279/): ArmorStart® LT - Multiple Denial-of-Service Vulnerabilities (high 8.7)
- [CVE-2025-9280](https://insights.sbomify.com/CVE-2025-9280/): ArmorStart® LT - Multiple Denial-of-Service Vulnerabilities (high 8.7)
- [CVE-2025-9281](https://insights.sbomify.com/CVE-2025-9281/): ArmorStart® LT - Multiple Denial-of-Service Vulnerabilities (high 8.7)
- [CVE-2025-9282](https://insights.sbomify.com/CVE-2025-9282/): ArmorStart® LT - Multiple Denial-of-Service Vulnerabilities (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-9466 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2025-9466 in the wild and no public exploit code.

Affected product: Rockwell Automation ArmorStart® LT. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-9466/ (Markdown: https://insights.sbomify.com/CVE-2025-9466/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-9466
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-9466
- OSV: https://osv.dev/vulnerability/CVE-2025-9466

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-9466/
Summaries are generated and may contain mistakes; the official description above is the record.