# CVE-2021-25337: Samsung Mobile Devices Improper Access Control

> Untrusted applications can read or write local files due to improper access control in the clipboard service on Samsung mobile devices.

- **Severity:** Medium 4.4 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Yes, since 8 Nov 2022 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 4 Mar 2021
- **Updated:** 21 Oct 2025
- **Also known as:** GHSA-7x25-8cjm-2rj9

## What is CVE-2021-25337?

CVE-2021-25337 is a medium-severity missing authorization vulnerability in Samsung Android, published on 4 Mar 2021. 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

Improper access control in clipboard service in Samsung mobile devices prior to SMR Mar-2021 Release 1 allows untrusted applications to read or write certain local files.

Weakness: CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2021-25337?

It affects 1 product.


Products: Samsung Android.

## How do I fix CVE-2021-25337?

No fix has been published for CVE-2021-25337 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 29 Nov 2022.

## Is CVE-2021-25337 being exploited?

Yes. Attackers have exploited CVE-2021-25337 in the wild since at least 8 Nov 2022.

Public exploit code:

- CVE-2021-25337 (github_poc): https://github.com/CrisZalSa/JustALampNothingElse

## 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-2021-25395](https://insights.sbomify.com/CVE-2021-25395/): Samsung Mobile Devices Race Condition (medium 6.4, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-25337 and fix it if it is affected.

What it is: CVE-2021-25337 is a medium-severity missing authorization vulnerability in Samsung Android, published on 4 Mar 2021. 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: Yes. Attackers have exploited CVE-2021-25337 in the wild since at least 8 Nov 2022.

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-2021-25337/ (Markdown: https://insights.sbomify.com/CVE-2021-25337/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-25337
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-25337
- OSV: https://osv.dev/vulnerability/CVE-2021-25337

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-25337/
Summaries are generated and may contain mistakes; the official description above is the record.