# CVE-2021-0664: Use after free in MT6765, MT6768, MT6771, MT6779, MT6785, MT6833, MT6853, MT6873, MT6877, MT6885, MT6889, MT8183, MT8385, MT8768, MT8788

> A use-after-free vulnerability in MediaTek chipset firmware allows local attackers with system privileges to escalate privileges without user interaction.

- **Severity:** Medium 6.7 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Nov 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-8v45-83mv-7j9c

## What is CVE-2021-0664?

CVE-2021-0664 is a medium-severity use after free vulnerability in Google Android, published on 18 Nov 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In ccu, there is a possible memory corruption due to a use after free. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS05827158; Issue ID: ALPS05827158.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2021-0664?

It affects 1 product.


Products: Google Android.

## How do I fix CVE-2021-0664?

No fix has been published for CVE-2021-0664 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-0664 being exploited?

There is no known exploitation of CVE-2021-0664 in the wild and no public exploit code.

## Other vulnerabilities in Google Android

- [CVE-2026-58704](https://insights.sbomify.com/CVE-2026-58704/): Google Pixel Improper Authorization (high 8.8, exploited in the wild)
- [CVE-2025-48543](https://insights.sbomify.com/CVE-2025-48543/): Android Runtime Use-After-Free (high 8.8, exploited in the wild)
- [CVE-2023-35674](https://insights.sbomify.com/CVE-2023-35674/): Android Framework Privilege Escalation (high 8.8, exploited in the wild)
- [CVE-2025-48595](https://insights.sbomify.com/CVE-2025-48595/): Android Framework Integer Overflow (high 8.4, exploited in the wild)
- [CVE-2024-32896](https://insights.sbomify.com/CVE-2024-32896/): Android Pixel Privilege Escalation (high 8.1, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-0664 and fix it if it is affected.

What it is: CVE-2021-0664 is a medium-severity use after free vulnerability in Google Android, published on 18 Nov 2021. 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-2021-0664 in the wild and no public exploit code.

Affected product: Google Android. 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-2021-0664/ (Markdown: https://insights.sbomify.com/CVE-2021-0664/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-0664
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-0664
- OSV: https://osv.dev/vulnerability/CVE-2021-0664

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-0664/
Summaries are generated and may contain mistakes; the official description above is the record.