# CVE-2021-43987: mySCADA myPRO

> An undocumented administrative account in mySCADA myPRO allows attackers to gain unauthorized privileged access to the system.

- **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:** 23 Dec 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-5jvw-w4j5-8wrq

## What is CVE-2021-43987?

CVE-2021-43987 is a critical vulnerability in mySCADA myPRO, published on 23 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An additional, nondocumented administrative account exists in mySCADA myPRO Versions 8.20.0 and prior that is not exposed through the web interface, which cannot be deleted or changed through the regular web interface.

Weakness: CWE-912 (Hidden Functionality)

## Which versions are affected by CVE-2021-43987?

It affects 1 product.


Products: Myscada Mypro.

## How do I fix CVE-2021-43987?

No fix has been published for CVE-2021-43987 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-43987 being exploited?

There is no known exploitation of CVE-2021-43987 in the wild and no public exploit code.

## Other vulnerabilities in mySCADA myPRO

- [CVE-2025-24865](https://insights.sbomify.com/CVE-2025-24865/): mySCADA myPRO Manager Missing Authentication for Critical Function (critical 10.0)
- [CVE-2021-22657](https://insights.sbomify.com/CVE-2021-22657/): mySCADA myPRO (critical 10.0)
- [CVE-2021-23198](https://insights.sbomify.com/CVE-2021-23198/): mySCADA myPRO (critical 10.0)
- [CVE-2021-43981](https://insights.sbomify.com/CVE-2021-43981/): mySCADA myPRO (critical 10.0)
- [CVE-2021-43984](https://insights.sbomify.com/CVE-2021-43984/): mySCADA myPRO (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-43987 and fix it if it is affected.

What it is: CVE-2021-43987 is a critical vulnerability in mySCADA myPRO, published on 23 Dec 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-2021-43987 in the wild and no public exploit code.

Affected product: mySCADA myPRO. 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-2021-43987/ (Markdown: https://insights.sbomify.com/CVE-2021-43987/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-43987
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-43987
- OSV: https://osv.dev/vulnerability/CVE-2021-43987

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-43987/
Summaries are generated and may contain mistakes; the official description above is the record.