# CVE-2025-20939: Missing authorization in Samsung Mobile Devices

> Physical attackers can modify the device unique identifier on Samsung Galaxy Watches due to improper authorization in the wireless download protocol.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L`)
- **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:** No
- **Published:** 8 Apr 2025
- **Updated:** 8 Apr 2025
- **Also known as:** GHSA-h477-9mjj-79jx

## What is CVE-2025-20939?

CVE-2025-20939 is a medium-severity missing authorization vulnerability in Samsung Mobile Devices, published on 8 Apr 2025. 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 authorization in wireless download protocol in Galaxy Watch prior to SMR Apr-2025 Release 1 allows physical attackers to update device unique identifier of Watch devices.

## Which versions are affected by CVE-2025-20939?

It affects 1 product.


Products: Samsung Wear Os.

## How do I fix CVE-2025-20939?

No fix has been published for CVE-2025-20939 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-20939 being exploited?

There is no known exploitation of CVE-2025-20939 in the wild and no public exploit code.

## Other vulnerabilities in Samsung Mobile Devices

- [CVE-2025-20946](https://insights.sbomify.com/CVE-2025-20946/): Security feature bypass in Samsung Mobile Devices (high 8.8)
- [CVE-2025-20984](https://insights.sbomify.com/CVE-2025-20984/): Missing authorization in Samsung Mobile Devices (medium 6.8)
- [CVE-2025-20997](https://insights.sbomify.com/CVE-2025-20997/): Misconfiguration in Samsung Mobile Devices (medium 6.2)
- [CVE-2025-21004](https://insights.sbomify.com/CVE-2025-21004/): Missing authorization in Samsung Mobile Devices (medium 6.2)
- [CVE-2025-20910](https://insights.sbomify.com/CVE-2025-20910/): Missing authorization in Samsung Mobile Devices (medium 6.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-20939 and fix it if it is affected.

What it is: CVE-2025-20939 is a medium-severity missing authorization vulnerability in Samsung Mobile Devices, published on 8 Apr 2025. 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-2025-20939 in the wild and no public exploit code.

Affected product: Samsung Mobile Devices. 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-2025-20939/ (Markdown: https://insights.sbomify.com/CVE-2025-20939/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-20939
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-20939
- OSV: https://osv.dev/vulnerability/CVE-2025-20939

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-20939/
Summaries are generated and may contain mistakes; the official description above is the record.