# CVE-2020-5806: Integer overflow in Rockwell FactoryTalk Linx

> An attacker can cause a denial of service in Rockwell FactoryTalk Linx by sending a crafted message that triggers an integer overflow in memory allocation.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-3g7c-253j-whp9

## What is CVE-2020-5806?

CVE-2020-5806 is a medium-severity vulnerability in Rockwell FactoryTalk Linx, published on 29 Dec 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An attacker-controlled memory allocation size can be passed to the C++ new operator in the CServerManager::HandleBrowseLoadIconStreamRequest in messaging.dll. This can be done by sending a specially crafted message to 127.0.0.1:7153. Observed in FactoryTalk Linx 6.11. All versions of FactoryTalk Linx are affected.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2020-5806?

It affects 1 product.


Products: Rockwellautomation Factorytalk Linx.

## How do I fix CVE-2020-5806?

No fix has been published for CVE-2020-5806 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5806 being exploited?

There is no known exploitation of CVE-2020-5806 in the wild and no public exploit code.

## Other vulnerabilities in Rockwell FactoryTalk Linx

- [CVE-2020-27251](https://insights.sbomify.com/CVE-2020-27251/): Memory corruption in FactoryTalk Linx (critical 9.8)
- [CVE-2020-12001](https://insights.sbomify.com/CVE-2020-12001/): Path traversal in FactoryTalk Linx, RSLinx Classic, Connected Components Workbench, ControlFLASH Plus, FactoryTalk Asset Centre, FactoryTalk Linx CommDTM, Studio 5000 Launcher, Studio 5000 Logix Designer software (critical 9.8)
- [CVE-2025-9067](https://insights.sbomify.com/CVE-2025-9067/): Rockwell Automation FactoryTalk® Linx Privilege Escalation Vulnerabilities (high 8.5)
- [CVE-2025-9068](https://insights.sbomify.com/CVE-2025-9068/): Rockwell Automation FactoryTalk® Linx Privilege Escalation Vulnerabilities (high 8.5)
- [CVE-2025-7972](https://insights.sbomify.com/CVE-2025-7972/): Rockwell Automation FactoryTalk® Linx Network Browser Security Bypass Vulnerability (high 8.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5806 and fix it if it is affected.

What it is: CVE-2020-5806 is a medium-severity vulnerability in Rockwell FactoryTalk Linx, published on 29 Dec 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-5806 in the wild and no public exploit code.

Affected product: Rockwell FactoryTalk Linx. 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-2020-5806/ (Markdown: https://insights.sbomify.com/CVE-2020-5806/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5806
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5806
- OSV: https://osv.dev/vulnerability/CVE-2020-5806

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5806/
Summaries are generated and may contain mistakes; the official description above is the record.