# CVE-2020-27255: Information disclosure in FactoryTalk Linx

> Remote unauthenticated attackers can leak sensitive information via heap overflow, enabling ASLR bypass in FactoryTalk Linx.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Nov 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-q4jm-4p9g-2h6g

## What is CVE-2020-27255?

CVE-2020-27255 is a high-severity vulnerability in FactoryTalk Linx, published on 26 Nov 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A heap overflow vulnerability exists within FactoryTalk Linx Version 6.11 and prior. This vulnerability could allow a remote, unauthenticated attacker to send malicious set attribute requests, which could result in the leaking of sensitive information. This information disclosure could lead to the bypass of address space layout randomization (ASLR).

Weakness: CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2020-27255?

It affects 1 product.


Products: Rockwellautomation Factorytalk Linx.

## How do I fix CVE-2020-27255?

No fix has been published for CVE-2020-27255 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-27255 being exploited?

There is no known exploitation of CVE-2020-27255 in the wild and no public exploit code.

## Other vulnerabilities in 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-2020-27255 and fix it if it is affected.

What it is: CVE-2020-27255 is a high-severity vulnerability in FactoryTalk Linx, published on 26 Nov 2020. 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-2020-27255 in the wild and no public exploit code.

Affected product: 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-2020-27255/ (Markdown: https://insights.sbomify.com/CVE-2020-27255/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-27255
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-27255
- OSV: https://osv.dev/vulnerability/CVE-2020-27255

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-27255/
Summaries are generated and may contain mistakes; the official description above is the record.