# CVE-2021-32926: Other in Micro800, MicroLogix 1400

> An attacker can intercept password change requests to replace the new password hash, locking the legitimate user out of the PLC controller.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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:** 3 Jun 2021
- **Updated:** 4 Jun 2026
- **Also known as:** GHSA-h2f7-g9rh-rr7g

## What is CVE-2021-32926?

CVE-2021-32926 is a medium-severity vulnerability in Micro800, MicroLogix 1400, published on 3 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

When an authenticated password change request takes place, this vulnerability could allow the attacker to intercept the message that includes the legitimate, new password hash and replace it with an illegitimate hash. The user would no longer be able to authenticate to the controller (Micro800: All versions, MicroLogix 1400: Version 21 and later) causing a denial-of-service condition

Weakness: CWE-300 (Channel Accessible by Non-Endpoint)

## Which versions are affected by CVE-2021-32926?

It affects 2 products.


Products: Rockwellautomation Micro800 Firmware, Rockwellautomation Micrologix 1400 Firmware.

## How do I fix CVE-2021-32926?

No fix has been published for CVE-2021-32926 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-32926 being exploited?

There is no known exploitation of CVE-2021-32926 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-32926 and fix it if it is affected.

What it is: CVE-2021-32926 is a medium-severity vulnerability in Micro800, MicroLogix 1400, published on 3 Jun 2021. 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-2021-32926 in the wild and no public exploit code.

Affected product: Micro800, MicroLogix 1400. 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-2021-32926/ (Markdown: https://insights.sbomify.com/CVE-2021-32926/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-32926
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-32926
- OSV: https://osv.dev/vulnerability/CVE-2021-32926

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-32926/
Summaries are generated and may contain mistakes; the official description above is the record.