# CVE-2024-3493: Rockwell Automation ControlLogix and GaurdLogix Vulnerable to Major Nonrecoverable Fault Due to Invalid Header Value

> A malformed fragmented packet causes a major nonrecoverable fault in Rockwell PLCs, requiring manual restart and potentially losing control of connected devices.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Apr 2024
- **Updated:** 12 Aug 2024
- **Also known as:** GHSA-mjg4-p237-8j88

## What is CVE-2024-3493?

CVE-2024-3493 is a high-severity denial of service vulnerability in Rockwell Automation 1756-EN4TR, published on 15 Apr 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A specific malformed fragmented packet type (fragmented packets may be generated automatically by devices that send large amounts of data) can cause a major nonrecoverable fault (MNRF) Rockwell Automation's ControlLogix 5580, Guard Logix 5580, CompactLogix 5380, and 1756-EN4TR. If exploited, the affected product will become unavailable and require a manual restart to recover it. Additionally, an MNRF could result in a loss of view and/or control of connected devices.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2024-3493?

It affects 8 products.


Products: Rockwellautomation 1756-En4tr Firmware, Rockwellautomation Compact Guardlogix 5380 Firmware, Rockwellautomation Compactlogix 5380 Firmware, Rockwellautomation Compactlogix 5380 Process Firmware, Rockwellautomation Compactlogix 5480 Firmware, Rockwellautomation Controllogix 5580 Firmware, Rockwellautomation Controllogix 5580 Process Firmware, Rockwellautomation Guardlogix 5580 Firmware.

## How do I fix CVE-2024-3493?

No fix has been published for CVE-2024-3493 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-3493 being exploited?

There is no known exploitation of CVE-2024-3493 in the wild and no public exploit code.

## Other vulnerabilities in Rockwell Automation 1756-EN4TR

- [CVE-2024-8626](https://insights.sbomify.com/CVE-2024-8626/): Logix Controllers Vulnerable to Denial-of-Service Vulnerability (high 8.7)
- [CVE-2023-3596](https://insights.sbomify.com/CVE-2023-3596/): Rockwell Automation Allen-Bradley ControlLogix Communication Modules vulnerable to Denial of Service (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-3493 and fix it if it is affected.

What it is: CVE-2024-3493 is a high-severity denial of service vulnerability in Rockwell Automation 1756-EN4TR, published on 15 Apr 2024. 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-2024-3493 in the wild and no public exploit code.

Affected product: Rockwell Automation 1756-EN4TR. 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-2024-3493/ (Markdown: https://insights.sbomify.com/CVE-2024-3493/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-3493
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-3493
- OSV: https://osv.dev/vulnerability/CVE-2024-3493

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From sbomify Insights: https://insights.sbomify.com/CVE-2024-3493/
Summaries are generated and may contain mistakes; the official description above is the record.