# CVE-2024-6077: Denial of service in 1756-EN4

> Attackers can cause denial of service on Rockwell Automation PLCs by sending crafted CIP packets, requiring a factory reset to recover.

- **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:** 12 Sep 2024
- **Updated:** 12 Sep 2024
- **Also known as:** GHSA-vpx9-6rc9-v679

## What is CVE-2024-6077?

CVE-2024-6077 is a high-severity denial of service vulnerability in Rockwell Automation 1756-EN4, published on 12 Sep 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A denial-of-service vulnerability exists in the Rockwell Automation affected products when specially crafted packets are sent to the CIP Security Object. If exploited the device will become unavailable and require a factory reset to recover.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2024-6077?

It affects 7 products.


Products: Rockwellautomation 1756-En4 Firmware, Rockwellautomation Compact Guardlogix 5380 Sil 2 Firmware, Rockwellautomation Compact Guardlogix 5380 Sil 3 Firmware, Rockwellautomation Compactlogix 5380 Firmware, Rockwellautomation Compactlogix 5480 Firmware, Rockwellautomation Controllogix 5580 Firmware, Rockwellautomation Guardlogix 5580 Firmware.

## How do I fix CVE-2024-6077?

No fix has been published for CVE-2024-6077 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-6077 being exploited?

There is no known exploitation of CVE-2024-6077 in the wild and no public exploit code.

## Other vulnerabilities in Rockwell Automation 1756-EN4

- [CVE-2024-5659](https://insights.sbomify.com/CVE-2024-5659/): Rockwell Automation Multicast Request Causes major nonrecoverable fault on Select Controllers (high 8.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-6077 and fix it if it is affected.

What it is: CVE-2024-6077 is a high-severity denial of service vulnerability in Rockwell Automation 1756-EN4, published on 12 Sep 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-2024-6077 in the wild and no public exploit code.

Affected product: Rockwell Automation 1756-EN4. 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-2024-6077/ (Markdown: https://insights.sbomify.com/CVE-2024-6077/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-6077
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-6077
- OSV: https://osv.dev/vulnerability/CVE-2024-6077

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-6077/
Summaries are generated and may contain mistakes; the official description above is the record.