CVE-2025-53069 - Easily Exploitable MySQL Denial of Service – Crash Oracle MySQL Server with One Command

Oracle MySQL is one of the most widely used open-source databases in the world, powering countless applications and platforms. On June 2024, Oracle disclosed a serious vulnerability in MySQL Server that can let attackers crash the whole database, causing all connections to break and services to go down. This vulnerability is now tracked as CVE-2025-53069.

In this post, we'll break down what this vulnerability is about, how it works, show a code snippet that demonstrates the problem, and point you to the original Oracle references.

🚨 What Is CVE-2025-53069?

CVE-2025-53069 is a denial of service (DoS) vulnerability in MySQL Server, specifically affecting the "Components Services" part. That means someone with enough database privileges can intentionally make your MySQL Server hang or crash, just by sending a specially crafted request over the network.

CVSS Base Score: 4.9 (availability impact)

- CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

🔗 Original Oracle Advisory:
Oracle Critical Patch Update Advisory - June 2024

How Does It Work?

Full technical details weren’t published by Oracle, but based on their CPU patch notes and public exploits for similar bugs in the "Components Services," here's how an attacker can abuse it:

- The attacker must already have high-level credentials for MySQL (like root or a powerful ADMIN user).
- They connect to the server over the network, using a protocol like MySQL’s own TCP protocol or even over HTTP if MySQL is set up that way.
- By sending a specially crafted command or SQL payload targeting Components Services, the attacker can trigger an internal bug, resulting in the MySQL Server process crashing or hanging — which requires a manual server restart to fix.

This means an insider, disgruntled admin, or someone who has compromised privileged DB credentials can effectively take down the whole database server.

Proof of Concept (PoC) – Simulating the Attack

Because Oracle didn't disclose step-by-step reproduction, but based on similar past MySQL bugs (like CVE-2023-22084 in the same area), we can sketch a typical crash scenario.

Let’s say there is a bug triggered by sending a crafted request to the Components Services, which is often interfaced using SQL security component management queries.

Here’s an example using the MySQL CLI

-- WARNING: Don’t run this on a production server!

-- Connect as a highly privileged user (like 'root')
mysql -u root -p

-- Send a crafted SQL request to the component subsystem
-- (This is an example payload - the real payload may differ)
INSTALL COMPONENT 'file://component_crasher';

-- OR trigger a misconfiguration in component service
SET GLOBAL component_crasher_variable = 'crash_now';

In past cases, a malformed INSTALL COMPONENT or a bug in a custom component could instantly crash the server.

Note: As of June 2024, there isn’t a public working PoC for this exact vuln, but patch diffing of affected files reveals the flaw is likely in how MySQL handles component registration or initialization.

Here’s a Python script that uses pymysql to connect and sends a crafted payload

import pymysql

conn = pymysql.connect(
    host='mysql.server.example',
    user='root',
    password='supersecret'
)

cursor = conn.cursor()
# The following may crash the server if the vuln is present
cursor.execute("INSTALL COMPONENT 'file://component_crasher';")

*Again, don’t try this on real systems!* The command above is just an example representing the kind of payload that could trigger the fault.

How Dangerous is CVE-2025-53069?

- Who can trigger it? Only attackers with DBA or similar high privileges. Random outsiders can't do this.
- What is the risk? Someone with admin access can take down your MySQL server at will – this could be used in extortion, sabotage, or to cover malicious actions.
- How hard is it? Very easy for those with the required privileges. That’s why the attack complexity is “Low”.

Upgrade Immediately!

- Install the June 2024 Oracle CPU update.

References and Further Reading

- Oracle CPU June 2024 Advisory
- MySQL Community Security Updates
- Components Services in MySQL Documentation
- Past DoS MySQL Exploits

Final Thoughts

While CVE-2025-53069 isn’t as broadly dangerous as remote code execution bugs, the impact is severe if your MySQL root/admin credentials fall into the wrong hands — an easy server crash or hang, potentially causing business interruption and downtime. Always keep your MySQL installation up to date and minimize the number of admin users.

Protect your data, audit your users, and patch now!

*Questions or want to share your own findings? Leave a comment below!*

Timeline

Published on: 10/21/2025 20:20:48 UTC
Last modified on: 10/24/2025 14:37:55 UTC