# CVE-2021-39994: Memory corruption in EMUI

> An arbitrary address access vulnerability in Huawei EMUI test code allows attackers to compromise service confidentiality, integrity, and availability.

- **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:** 9 Feb 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-ccp4-hvpw-9jmf

## What is CVE-2021-39994?

CVE-2021-39994 is a critical memory corruption vulnerability in Huawei Emui, published on 9 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

There is an arbitrary address access vulnerability with the product line test code.Successful exploitation of this vulnerability may affect service confidentiality, integrity, and availability.

## Which versions are affected by CVE-2021-39994?

It affects 1 product.


Products: Huawei Emui.

## How do I fix CVE-2021-39994?

No fix has been published for CVE-2021-39994 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-39994 being exploited?

There is no known exploitation of CVE-2021-39994 in the wild and no public exploit code.

## Other vulnerabilities in Huawei Emui

- [CVE-2023-52370](https://insights.sbomify.com/CVE-2023-52370/): Memory corruption in EMUI (critical 9.8)
- [CVE-2023-52378](https://insights.sbomify.com/CVE-2023-52378/): Business logic in EMUI (critical 9.8)
- [CVE-2023-52381](https://insights.sbomify.com/CVE-2023-52381/): Code injection in EMUI (critical 9.8)
- [CVE-2023-52103](https://insights.sbomify.com/CVE-2023-52103/): Memory corruption in EMUI (critical 9.8)
- [CVE-2023-46773](https://insights.sbomify.com/CVE-2023-46773/): Privilege escalation in EMUI (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-39994 and fix it if it is affected.

What it is: CVE-2021-39994 is a critical memory corruption vulnerability in Huawei Emui, published on 9 Feb 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-2021-39994 in the wild and no public exploit code.

Affected product: Huawei Emui. 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-2021-39994/ (Markdown: https://insights.sbomify.com/CVE-2021-39994/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-39994
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-39994
- OSV: https://osv.dev/vulnerability/CVE-2021-39994

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-39994/
Summaries are generated and may contain mistakes; the official description above is the record.