# CVE-2025-21520: Information disclosure in MySQL Cluster

> High-privileged local attackers can read a subset of MySQL Server data via a difficult-to-exploit vulnerability requiring user interaction.

- **Severity:** Low 1.8 (`CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 21 Jan 2025
- **Updated:** 3 Nov 2025
- **Also known as:** GHSA-394g-2wxx-rv2j, MINI-6w2h-qm9j-p52f, MINI-crj6-j678-55q8, MINI-vjp5-mjvh-8733, UBUNTU-CVE-2025-21520

## What is CVE-2025-21520?

CVE-2025-21520 is a low-severity vulnerability in Oracle Mysql Cluster, published on 21 Jan 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

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Options).  Supported versions that are affected are 8.0.40 and prior, 8.4.3 and prior and  9.1.0 and prior. Difficult to exploit vulnerability allows high privileged attacker with logon to the infrastructure where MySQL Server executes to compromise MySQL Server.  Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in  unauthorized read access to a subset of MySQL Server accessible data. CVSS 3.1 Base Score 1.8 (Confidentiality impacts).  CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N).

Weakness: CWE-732 (Incorrect Permission Assignment for Critical Resource)

## Which versions are affected by CVE-2025-21520?

It affects 2 products.


Products: Oracle Mysql Cluster, Oracle Mysql Server.

## How do I fix CVE-2025-21520?

Apply the vendor's patch.

## Is CVE-2025-21520 being exploited?

There is no known exploitation of CVE-2025-21520 in the wild and no public exploit code.

## Other vulnerabilities in Oracle Mysql Cluster

- [CVE-2026-60163](https://insights.sbomify.com/CVE-2026-60163/): Privilege escalation in MySQL Cluster (high 8.4)
- [CVE-2026-60592](https://insights.sbomify.com/CVE-2026-60592/): Denial of service in MySQL Cluster (high 8.2)
- [CVE-2026-60315](https://insights.sbomify.com/CVE-2026-60315/): Information disclosure in MySQL Cluster (high 8.2)
- [CVE-2026-101772](https://insights.sbomify.com/CVE-2026-101772/): Vulnerability in the MySQL Server, MySQL Cluster product of Oracle MySQL (component: Client programs). (high 8.1)
- [CVE-2026-70724](https://insights.sbomify.com/CVE-2026-70724/): Auth bypass in MySQL Cluster (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-21520 and fix it if it is affected.

What it is: CVE-2025-21520 is a low-severity vulnerability in Oracle Mysql Cluster, published on 21 Jan 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-2025-21520 in the wild and no public exploit code.

Affected product: Oracle Mysql Cluster. 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-2025-21520/ (Markdown: https://insights.sbomify.com/CVE-2025-21520/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-21520
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-21520
- OSV: https://osv.dev/vulnerability/CVE-2025-21520

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-21520/
Summaries are generated and may contain mistakes; the official description above is the record.