# CVE-2021-22277: AC 800M MMS - Denial of Service vulnerability in MMS communication

> An attacker can cause a denial of service in ABB 800xA control software via improper input validation in MMS communication.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/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:** 1 Apr 2022
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-88h6-w4mj-xwh4

## What is CVE-2021-22277?

CVE-2021-22277 is a high-severity denial of service vulnerability in ABB 800xA, Control Software for AC 800M, published on 1 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper Input Validation vulnerability in ABB 800xA, Control Software for AC 800M, Control Builder Safe, Compact Product Suite - Control and I/O, ABB Base Software for SoftControl allows an attacker to cause the denial of service.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-22277?

It affects 4 products.


Products: Abb 800xa, Abb Base Software, Abb Compact Product Suite, Abb Control Builder Safe.

## How do I fix CVE-2021-22277?

No fix has been published for CVE-2021-22277 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22277 being exploited?

There is no known exploitation of CVE-2021-22277 in the wild and no public exploit code.

## Other vulnerabilities in ABB 800xA, Control Software for AC 800M

- [CVE-2020-8484](https://insights.sbomify.com/CVE-2020-8484/): ABB System 800xA Inter process communication vulnerability - 800xA for DCI (high 7.8)
- [CVE-2020-8485](https://insights.sbomify.com/CVE-2020-8485/): ABB System 800xA Inter process communication vulnerability - 800xA for Mod 300 (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22277 and fix it if it is affected.

What it is: CVE-2021-22277 is a high-severity denial of service vulnerability in ABB 800xA, Control Software for AC 800M, published on 1 Apr 2022. 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-2021-22277 in the wild and no public exploit code.

Affected product: ABB 800xA, Control Software for AC 800M. 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-2021-22277/ (Markdown: https://insights.sbomify.com/CVE-2021-22277/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22277
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22277
- OSV: https://osv.dev/vulnerability/CVE-2021-22277

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-22277/
Summaries are generated and may contain mistakes; the official description above is the record.