# CVE-2021-25395: Samsung Mobile Devices Race Condition

> Local attackers can bypass signature checks in the MFC charger driver via a race condition if radio privileges are compromised.

- **Severity:** Medium 6.4 (`CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Yes, since 29 Jun 2023 (CISA KEV)
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Jun 2021
- **Updated:** 21 Oct 2025
- **Also known as:** GHSA-fj4w-55pf-m8j9

## What is CVE-2021-25395?

CVE-2021-25395 is a medium-severity vulnerability in Samsung Android, published on 11 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A race condition in MFC charger driver prior to SMR MAY-2021 Release 1 allows local attackers to bypass signature check given a radio privilege is compromised.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2021-25395?

It affects 1 product.


Products: Samsung Android.

## How do I fix CVE-2021-25395?

No fix has been published for CVE-2021-25395 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 20 Jul 2023.

## Is CVE-2021-25395 being exploited?

Yes. Attackers have exploited CVE-2021-25395 in the wild since at least 29 Jun 2023.

## Other vulnerabilities in Samsung Android

- [CVE-2025-21042](https://insights.sbomify.com/CVE-2025-21042/): Samsung Mobile Devices Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2025-21043](https://insights.sbomify.com/CVE-2025-21043/): Samsung Mobile Devices Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2021-25487](https://insights.sbomify.com/CVE-2021-25487/): Samsung Mobile Devices Out-of-Bounds Read (high 7.3, exploited in the wild)
- [CVE-2021-25394](https://insights.sbomify.com/CVE-2021-25394/): Samsung Mobile Devices Race Condition (medium 6.4, exploited in the wild)
- [CVE-2021-25369](https://insights.sbomify.com/CVE-2021-25369/): Samsung Mobile Devices Improper Access Control (medium 6.2, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-25395 and fix it if it is affected.

What it is: CVE-2021-25395 is a medium-severity vulnerability in Samsung Android, published on 11 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2021-25395 in the wild since at least 29 Jun 2023.

Affected product: Samsung 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-2021-25395/ (Markdown: https://insights.sbomify.com/CVE-2021-25395/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-25395
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-25395
- OSV: https://osv.dev/vulnerability/CVE-2021-25395

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-25395/
Summaries are generated and may contain mistakes; the official description above is the record.