# CVE-2017-16740: Memory corruption in Rockwell Automation Allen-Bradley MicroLogix 1400 Controllers

> A stack-based buffer overflow in Rockwell Automation MicroLogix 1400 controllers allows remote attackers to execute arbitrary code.

- **Severity:** Critical 10.0 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/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:** 9 Jan 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-f8m9-fwqj-74hf

## What is CVE-2017-16740?

CVE-2017-16740 is a critical memory corruption vulnerability in Rockwell Automation Allen-Bradley MicroLogix 1400 Controllers, published on 9 Jan 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A Buffer Overflow issue was discovered in Rockwell Automation Allen-Bradley MicroLogix 1400 Controllers, Series B and C Versions 21.002 and earlier. The stack-based buffer overflow vulnerability has been identified, which may allow remote code execution.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2017-16740?

It affects 6 products.


Products: Rockwellautomation 1766-L32awa Firmware, Rockwellautomation 1766-L32awaa Firmware, Rockwellautomation 1766-L32bwa Firmware, Rockwellautomation 1766-L32bwaa Firmware, Rockwellautomation 1766-L32bxb Firmware, Rockwellautomation 1766-L32bxba Firmware.

## How do I fix CVE-2017-16740?

No fix has been published for CVE-2017-16740 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-16740 being exploited?

There is no known exploitation of CVE-2017-16740 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-16740 and fix it if it is affected.

What it is: CVE-2017-16740 is a critical memory corruption vulnerability in Rockwell Automation Allen-Bradley MicroLogix 1400 Controllers, published on 9 Jan 2018. 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-2017-16740 in the wild and no public exploit code.

Affected product: Rockwell Automation Allen-Bradley MicroLogix 1400 Controllers. 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-2017-16740/ (Markdown: https://insights.sbomify.com/CVE-2017-16740/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-16740
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-16740
- OSV: https://osv.dev/vulnerability/CVE-2017-16740

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-16740/
Summaries are generated and may contain mistakes; the official description above is the record.