# CVE-2025-21021: Memory corruption in Blockchain Keystore

> Local privileged attackers can exploit an out-of-bounds write in the pinpad drawing to corrupt memory, potentially leading to code execution or privilege escalation.

- **Severity:** Medium 5.7 (`CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Aug 2025
- **Updated:** 26 Feb 2026
- **Also known as:** GHSA-gmg7-p663-wm59

## What is CVE-2025-21021?

CVE-2025-21021 is a medium-severity memory corruption vulnerability in Samsung Mobile Blockchain Keystore, published on 6 Aug 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Out-of-bounds write in drawing pinpad in Blockchain Keystore prior to version 1.3.17.2 allows local privileged attackers to write out-of-bounds memory.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2025-21021?

It affects 1 product.


Products: Samsung Blockchain Keystore.

## How do I fix CVE-2025-21021?

No fix has been published for CVE-2025-21021 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-21021 being exploited?

There is no known exploitation of CVE-2025-21021 in the wild and no public exploit code.

## Other vulnerabilities in Samsung Mobile Blockchain Keystore

- [CVE-2024-49406](https://insights.sbomify.com/CVE-2024-49406/): Other in Blockchain Keystore (medium 6.7)
- [CVE-2025-21017](https://insights.sbomify.com/CVE-2025-21017/): Memory corruption in Blockchain Keystore (medium 6.3)
- [CVE-2025-20900](https://insights.sbomify.com/CVE-2025-20900/): Memory corruption in Blockchain Keystore (medium 6.3)
- [CVE-2025-21020](https://insights.sbomify.com/CVE-2025-21020/): Memory corruption in Blockchain Keystore (medium 5.7)
- [CVE-2023-30722](https://insights.sbomify.com/CVE-2023-30722/): Security feature bypass in Samsung Blockchain Keystore (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-21021 and fix it if it is affected.

What it is: CVE-2025-21021 is a medium-severity memory corruption vulnerability in Samsung Mobile Blockchain Keystore, published on 6 Aug 2025. 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-2025-21021 in the wild and no public exploit code.

Affected product: Samsung Mobile Blockchain Keystore. 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-2025-21021/ (Markdown: https://insights.sbomify.com/CVE-2025-21021/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-21021
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-21021
- OSV: https://osv.dev/vulnerability/CVE-2025-21021

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-21021/
Summaries are generated and may contain mistakes; the official description above is the record.