# CVE-2021-2001: Denial of service in MySQL Server

> A high-privileged attacker can cause a complete denial of service in MySQL Server via the Optimizer component.

- **Severity:** Medium 4.9 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 20 Jan 2021
- **Updated:** 26 Sep 2024
- **Also known as:** GHSA-2r9w-7426-5qwr, UBUNTU-CVE-2021-2001

## What is CVE-2021-2001?

CVE-2021-2001 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 20 Jan 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 5.6.50 and prior, 5.7.30 and prior and 8.0.17 and prior. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server. 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 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

## Which versions are affected by CVE-2021-2001?

It affects 5 products.


Products: Fedoraproject Fedora, Netapp Oncommand Insight, Netapp Oncommand Workflow Automation, Netapp Snapcenter, Oracle Mysql.

## How do I fix CVE-2021-2001?

Upgrade to a fixed version.

## Is CVE-2021-2001 being exploited?

There is no known exploitation of CVE-2021-2001 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-2001 and fix it if it is affected.

What it is: CVE-2021-2001 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 20 Jan 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-2001 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2021-2001/ (Markdown: https://insights.sbomify.com/CVE-2021-2001/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-2001
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-2001
- OSV: https://osv.dev/vulnerability/CVE-2021-2001

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-2001/
Summaries are generated and may contain mistakes; the official description above is the record.