# CVE-2023-21243: Denial of service in Android

> A buffer overflow in Android's Passpoint configuration validation allows local attackers to cause a denial of service via a crafted config file.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 12 Jul 2023
- **Updated:** 6 Nov 2024
- **Also known as:** A-274445194, ASB-A-274445194, GHSA-5vx9-r389-x79h

## What is CVE-2023-21243?

CVE-2023-21243 is a medium-severity denial of service vulnerability in Google Android, published on 12 Jul 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

In validateForCommonR1andR2 of PasspointConfiguration.java, there is a possible way to inflate the size of a config file with no limits due to a buffer overflow. This could lead to local denial of service with no additional execution privileges needed. User interaction is needed for exploitation.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2023-21243?

It affects 1 product.


Products: Google Android.

## How do I fix CVE-2023-21243?

Apply the vendor's patch.

## Is CVE-2023-21243 being exploited?

There is no known exploitation of CVE-2023-21243 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-2023-21243 and fix it if it is affected.

What it is: CVE-2023-21243 is a medium-severity denial of service vulnerability in Google Android, published on 12 Jul 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-21243 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-2023-21243/ (Markdown: https://insights.sbomify.com/CVE-2023-21243/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-21243
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-21243
- OSV: https://osv.dev/vulnerability/CVE-2023-21243

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-21243/
Summaries are generated and may contain mistakes; the official description above is the record.