# CVE-2021-46786: Memory corruption in EMUI

> Attackers can exploit an audio module flaw in Huawei EMUI and HarmonyOS to trigger out-of-bounds memory access, potentially leading to code execution or privilege escalation.

- **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:** 13 May 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-gf86-696w-hj6m

## What is CVE-2021-46786?

CVE-2021-46786 is a critical memory corruption vulnerability in Huawei Emui, published on 13 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The audio module has a vulnerability in verifying the parameters passed by the application space.Successful exploitation of this vulnerability may cause out-of-bounds memory access.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2021-46786?

It affects 3 products.


Products: Huawei Emui, Huawei Harmonyos, Huawei Magic Ui.

## How do I fix CVE-2021-46786?

No fix has been published for CVE-2021-46786 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-46786 being exploited?

There is no known exploitation of CVE-2021-46786 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-2021-46786 and fix it if it is affected.

What it is: CVE-2021-46786 is a critical memory corruption vulnerability in Huawei Emui, published on 13 May 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-2021-46786 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-2021-46786/ (Markdown: https://insights.sbomify.com/CVE-2021-46786/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-46786
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-46786
- OSV: https://osv.dev/vulnerability/CVE-2021-46786

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-46786/
Summaries are generated and may contain mistakes; the official description above is the record.