# CVE-2021-33061: Denial of service in Intel(R) 82599 Ethernet Controllers and Adapters

> An authenticated local user can cause a denial of service in Intel 82599 Ethernet Controllers due to insufficient control flow management.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Feb 2022
- **Updated:** 5 May 2025
- **Also known as:** DEBIAN-CVE-2021-33061, GHSA-pvxv-cw79-c2x3, UBUNTU-CVE-2021-33061

## What is CVE-2021-33061?

CVE-2021-33061 is a medium-severity denial of service vulnerability in Intel(R) 82599 Ethernet Controllers and Adapters, published on 9 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Insufficient control flow management for the Intel(R) 82599 Ethernet Controllers and Adapters may allow an authenticated user to potentially enable denial of service via local access.

## Which versions are affected by CVE-2021-33061?

It affects 3 products.


Products: Intel 82599eb Firmware, Intel 82599en Firmware, Intel 82599es Firmware.

## How do I fix CVE-2021-33061?

Apply the vendor's patch.

## Is CVE-2021-33061 being exploited?

There is no known exploitation of CVE-2021-33061 in the wild and no public exploit code.

## Other vulnerabilities in Intel(R) 82599 Ethernet Controllers and Adapters

- [CVE-2021-33096](https://insights.sbomify.com/CVE-2021-33096/): Denial of service in Intel(R) 82599 Ethernet Controllers and Adapters (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33061 and fix it if it is affected.

What it is: CVE-2021-33061 is a medium-severity denial of service vulnerability in Intel(R) 82599 Ethernet Controllers and Adapters, published on 9 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-33061 in the wild and no public exploit code.

Affected product: Intel(R) 82599 Ethernet Controllers and Adapters. 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-2021-33061/ (Markdown: https://insights.sbomify.com/CVE-2021-33061/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33061
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33061
- OSV: https://osv.dev/vulnerability/CVE-2021-33061

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33061/
Summaries are generated and may contain mistakes; the official description above is the record.