# CVE-2023-3595: Rockwell Automation ControlLogix Communication Modules Vulnerable to Remote Code Execution

> Remote attackers can execute code and manipulate data on Rockwell ControlLogix communication modules via crafted CIP messages.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 12 Jul 2023
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-qvv4-3g8f-rgjx

## What is CVE-2023-3595?

CVE-2023-3595 is a critical memory corruption vulnerability in Rockwell Auotmation 1756-EN2F Series A, B, published on 12 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Where this vulnerability exists in the Rockwell Automation 1756 EN2* and 1756 EN3* ControlLogix communication products, it could allow a malicious user to perform remote code execution with persistence on the target system through maliciously crafted CIP messages. This includes the ability to modify, deny, and exfiltrate data passing through the device.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2023-3595?

It affects 12 products.


Products: Rockwellautomation 1756-En2f Series a Firmware, Rockwellautomation 1756-En2f Series B Firmware, Rockwellautomation 1756-En2f Series C Firmware, Rockwellautomation 1756-En2t Series a Firmware, Rockwellautomation 1756-En2t Series B Firmware, Rockwellautomation 1756-En2t Series C Firmware, Rockwellautomation 1756-En2t Series D Firmware, Rockwellautomation 1756-En2tr Series a Firmware, Rockwellautomation 1756-En2tr Series B Firmware, Rockwellautomation 1756-En2tr Series C Firmware, Rockwellautomation 1756-En3tr Series a Firmware, Rockwellautomation 1756-En3tr Series B Firmware.

## How do I fix CVE-2023-3595?

No fix has been published for CVE-2023-3595 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-3595 being exploited?

There is no known exploitation of CVE-2023-3595 in the wild and no public exploit code.

## Other vulnerabilities in Rockwell Auotmation 1756-EN2F Series A, B

- [CVE-2023-2262](https://insights.sbomify.com/CVE-2023-2262/): Rockwell Automation Select Logix Communication Modules Vulnerable to Email Object Buffer Overflow (critical 9.8)
- [CVE-2018-17924](https://insights.sbomify.com/CVE-2018-17924/): Missing authorization in Rockwell Automation (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-3595 and fix it if it is affected.

What it is: CVE-2023-3595 is a critical memory corruption vulnerability in Rockwell Auotmation 1756-EN2F Series A, B, published on 12 Jul 2023. 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-2023-3595 in the wild and no public exploit code.

Affected product: Rockwell Auotmation 1756-EN2F Series A, B. 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-2023-3595/ (Markdown: https://insights.sbomify.com/CVE-2023-3595/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-3595
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-3595
- OSV: https://osv.dev/vulnerability/CVE-2023-3595

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-3595/
Summaries are generated and may contain mistakes; the official description above is the record.