# CVE-2025-30721: Denial of service in MySQL Server

> A high-privileged attacker can cause a complete denial of service in MySQL Server via the UDF component, requiring local access and user interaction.

- **Severity:** Medium 4.0 (`CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H`)
- **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:** 15 Apr 2025
- **Updated:** 3 Nov 2025
- **Also known as:** AZL-62163, AZL-62182, GHSA-v29c-h5f4-7c2v, MINI-7wg7-fp3v-qx4v, MINI-g6cf-85fc-qhgc, MINI-v99m-fpx9-q462, UBUNTU-CVE-2025-30721

## What is CVE-2025-30721?

CVE-2025-30721 is a medium-severity denial of service vulnerability in Oracle Mysql Server, published on 15 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

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: UDF).  Supported versions that are affected are 8.0.0-8.0.41, 8.4.0-8.4.4 and  9.0.0-9.2.0. 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 ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 4.0 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H).

## Which versions are affected by CVE-2025-30721?

It affects 1 product.


Products: Oracle Mysql Server.

## How do I fix CVE-2025-30721?

Apply the vendor's patch.

## Is CVE-2025-30721 being exploited?

There is no known exploitation of CVE-2025-30721 in the wild and no public exploit code.

## Other vulnerabilities in Oracle Mysql Server

- [CVE-2025-21521](https://insights.sbomify.com/CVE-2025-21521/): Denial of service in MySQL Server (high 7.5)
- [CVE-2023-21912](https://insights.sbomify.com/CVE-2023-21912/): Denial of service in MySQL Server (high 7.5)
- [CVE-2026-22009](https://insights.sbomify.com/CVE-2026-22009/): Denial of service in MySQL Server (medium 6.5)
- [CVE-2026-22017](https://insights.sbomify.com/CVE-2026-22017/): Denial of service in MySQL Server (medium 6.5)
- [CVE-2026-34270](https://insights.sbomify.com/CVE-2026-34270/): Denial of service in MySQL Server (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-30721 and fix it if it is affected.

What it is: CVE-2025-30721 is a medium-severity denial of service vulnerability in Oracle Mysql Server, published on 15 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-2025-30721 in the wild and no public exploit code.

Affected product: Oracle Mysql Server. 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-2025-30721/ (Markdown: https://insights.sbomify.com/CVE-2025-30721/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-30721
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-30721
- OSV: https://osv.dev/vulnerability/CVE-2025-30721

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-30721/
Summaries are generated and may contain mistakes; the official description above is the record.