# CVE-2021-39653: Security feature bypass in Android

> Attackers can bypass security warnings to enable hidden debug policies, leading to local privilege escalation on Android devices.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:** 15 Dec 2021
- **Updated:** 4 Aug 2024
- **Also known as:** A-193443223, GHSA-gpj3-wgx2-4p9v, PUB-A-193443223

## What is CVE-2021-39653?

CVE-2021-39653 is a high-severity vulnerability in Google Android, published on 15 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In (TBD) of (TBD), there is a possible way to boot with a hidden debug policy due to a missing warning to the user. This could lead to local escalation of privilege after preparing the device, hiding the warning, and passing the phone to a new user, with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-193443223References: N/A

## Which versions are affected by CVE-2021-39653?

It affects 1 product.


Products: Google Android.

## How do I fix CVE-2021-39653?

Apply the vendor's patch.

## Is CVE-2021-39653 being exploited?

There is no known exploitation of CVE-2021-39653 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-2021-39653 and fix it if it is affected.

What it is: CVE-2021-39653 is a high-severity vulnerability in Google Android, published on 15 Dec 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-2021-39653 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-2021-39653/ (Markdown: https://insights.sbomify.com/CVE-2021-39653/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-39653
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-39653
- OSV: https://osv.dev/vulnerability/CVE-2021-39653

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-39653/
Summaries are generated and may contain mistakes; the official description above is the record.