# CVE-2021-33120: Information disclosure in Intel Atom(R) Processors

> Authenticated users can exploit a microarchitectural flaw in Intel Atom processors to disclose information or cause denial of service.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Feb 2022
- **Updated:** 5 May 2025
- **Also known as:** DEBIAN-CVE-2021-33120, GHSA-43wc-84x4-9vfc, UBUNTU-CVE-2021-33120

## What is CVE-2021-33120?

CVE-2021-33120 is a medium-severity vulnerability in Intel Atom(R) Processors, published on 9 Feb 2022. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Out of bounds read under complex microarchitectural condition in memory subsystem for some Intel Atom(R) Processors may allow authenticated user to potentially enable information disclosure or cause denial of service via network access.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2021-33120?

It affects 25 products.


Products: Intel Atom P5921b Firmware, Intel Atom P5931b Firmware, Intel Atom P5942b Firmware, Intel Atom P5962b Firmware, Intel Atom X6200fe Firmware, Intel Atom X6211e Firmware, Intel Atom X6212re Firmware, Intel Atom X6413e Firmware, Intel Atom X6425e Firmware, Intel Atom X6425re Firmware, Intel Atom X6427fe Firmware, Intel Celeron J6413 Firmware, Intel Celeron N4500 Firmware, Intel Celeron N4505 Firmware, Intel Celeron N5100 Firmware, Intel Celeron N5105 Firmware, Intel Celeron N6211 Firmware, Intel Core I3-L13g4 Firmware, Intel Core I5-L16g7 Firmware, Intel Pentium J6425 Firmware and 5 more.

## How do I fix CVE-2021-33120?

Apply the vendor's patch.

## Is CVE-2021-33120 being exploited?

There is no known exploitation of CVE-2021-33120 in the wild and no public exploit code.

## Other vulnerabilities in Intel Atom(R) Processors

- [CVE-2022-0004](https://insights.sbomify.com/CVE-2022-0004/): Security feature bypass in Intel(R) Processors in Intel(R) Boot Guard and Intel(R) TXT (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33120 and fix it if it is affected.

What it is: CVE-2021-33120 is a medium-severity vulnerability in Intel Atom(R) Processors, published on 9 Feb 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-33120 in the wild and no public exploit code.

Affected product: Intel Atom(R) Processors. 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-2021-33120/ (Markdown: https://insights.sbomify.com/CVE-2021-33120/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33120
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33120
- OSV: https://osv.dev/vulnerability/CVE-2021-33120

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33120/
Summaries are generated and may contain mistakes; the official description above is the record.