# CVE-2021-4479: Dräger Atlan A350 1.00 <= 1.01 DoS via Medibus Interface

> Attackers can cause denial of service on Dräger Atlan A350 ventilators by sending malformed data via the Medibus interface, disrupting device operation.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Jun 2026
- **Updated:** 10 Jun 2026
- **Also known as:** GHSA-744p-v485-p6h6

## What is CVE-2021-4479?

CVE-2021-4479 is a medium-severity denial of service vulnerability in Dräger Atlan A350, published on 2 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Dräger Atlan A350 versions 1.00 up to and including 1.01 contains an improper input handling vulnerability that allows attackers to cause a denial of service by sending specifically crafted non-Medibus-compliant data through the Medibus interface. Attackers can transmit malformed data to overload the internal processor, gradually disrupting device operation over several hours and causing loss of data transmission, delayed display of real-time curves, and deviation between displayed airway pressure values and screen curves.

Weakness: CWE-1286 (Improper Validation of Syntactic Correctness of Input)

## Which versions are affected by CVE-2021-4479?


## How do I fix CVE-2021-4479?

No fix has been published for CVE-2021-4479 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-4479 being exploited?

There is no known exploitation of CVE-2021-4479 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-4479 and fix it if it is affected.

What it is: CVE-2021-4479 is a medium-severity denial of service vulnerability in Dräger Atlan A350, published on 2 Jun 2026. 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-2021-4479 in the wild and no public exploit code.

Affected product: Dräger Atlan A350. 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-2021-4479/ (Markdown: https://insights.sbomify.com/CVE-2021-4479/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-4479
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-4479
- OSV: https://osv.dev/vulnerability/CVE-2021-4479

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-4479/
Summaries are generated and may contain mistakes; the official description above is the record.