CVE-2025-53069: Oracle MySQL Server DOS Vulnerability

CVE-2025-53069 Overview

CVE-2025-53069 is a denial-of-service vulnerability in the Oracle MySQL Server product, specifically within the Server: Components Services component. Affected versions include MySQL Server 8.0.0-8.0.43, 8.4.0-8.4.6, and 9.0.0-9.4.0. A high-privileged attacker with network access via multiple protocols can trigger a server hang or repeatable crash, resulting in complete denial of service. The flaw is tracked under CWE-770: Allocation of Resources Without Limits or Throttling. Oracle disclosed the issue as part of its October 2025 Critical Patch Update.

Critical Impact
Successful exploitation causes a complete availability loss of the MySQL Server, disrupting all dependent applications and services until the database instance is restarted.

Affected Products

Oracle MySQL Server versions 8.0.0 through 8.0.43
Oracle MySQL Server versions 8.4.0 through 8.4.6
Oracle MySQL Server versions 9.0.0 through 9.4.0

Discovery Timeline

2025-10-21 - CVE-2025-53069 published to the National Vulnerability Database
2025-10-21 - Oracle released the fix in the October 2025 Critical Patch Update
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-53069

Vulnerability Analysis

The vulnerability resides in the Server: Components Services subsystem of Oracle MySQL Server. An authenticated attacker holding high privileges can send crafted requests over supported network protocols to force the server into a hang state or a repeatable crash. Because the flaw affects availability only, no confidentiality or integrity impact is expected. The classification under CWE-770 indicates the server allocates or manages resources without enforcing sufficient limits, allowing an attacker to exhaust or destabilize a critical code path. Recovery requires restarting the MySQL Server process, which disrupts every application that depends on the database.

Root Cause

Oracle's advisory maps the issue to improper resource handling within Components Services. The condition can be reached repeatedly, indicating deterministic behavior rather than a race. Oracle has not published the underlying source-level detail. Refer to the Oracle Critical Patch Update Advisory - October 2025 for vendor guidance.

Attack Vector

Exploitation requires network access to the MySQL Server and valid credentials with high privileges, such as an administrative database account. No user interaction is required. The attacker connects over a supported MySQL protocol and issues the triggering operation against the vulnerable component. Because the required privilege level is high, the practical risk is greatest in environments where administrative accounts are shared, weakly protected, or exposed to lateral-movement scenarios. No public proof-of-concept or exploit code is available at the time of publication, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2025-53069

Indicators of Compromise

Unexpected MySQL Server process termination or hang states without corresponding administrative maintenance windows.
Repeated crash entries in the MySQL error log referencing Components Services or abnormal thread termination.
Sudden spikes in failed client connections or query timeouts against a previously stable database instance.

Detection Strategies

Monitor MySQL server logs (error.log) for stack traces, signal-based shutdowns, or mysqld got signal messages.
Track authenticated sessions from high-privilege accounts and correlate them with server restarts or availability incidents.
Alert on repeated crash-restart cycles of the mysqld service within short time windows.

Monitoring Recommendations

Ingest MySQL error logs, audit logs, and process telemetry into a centralized SIEM or data lake for correlation.
Baseline normal administrative activity and flag anomalous protocol usage from privileged accounts.
Configure health checks that detect hang conditions distinct from complete process crashes, since both are possible outcomes.

How to Mitigate CVE-2025-53069

Immediate Actions Required

Apply the October 2025 Oracle Critical Patch Update to all affected MySQL Server instances as the primary remediation.
Inventory all MySQL deployments and confirm running versions against the affected ranges 8.0.0-8.0.43, 8.4.0-8.4.6, and 9.0.0-9.4.0.
Rotate credentials for high-privilege accounts and audit recent administrative access to identify unexpected activity.

Patch Information

Oracle addressed CVE-2025-53069 in the Oracle Critical Patch Update - October 2025. Administrators should upgrade to a MySQL Server release that includes the October 2025 CPU fixes. Oracle recommends applying Critical Patch Updates without delay because unpatched vulnerabilities have historically been targeted by attackers.

Workarounds

Restrict network access to MySQL Server so only trusted application hosts and administrative jump boxes can reach the database port.
Enforce least-privilege administration by removing unnecessary high-privilege grants and requiring multi-factor authentication for privileged accounts.
Enable the MySQL audit plugin to record connections and administrative statements from privileged users for forensic review.

bash

# Configuration example: restrict MySQL access at the network and account layer
# 1) Bind MySQL to internal interfaces only
# In /etc/mysql/mysql.conf.d/mysqld.cnf
bind-address = 10.0.0.10

# 2) Firewall the MySQL port to trusted application subnets only
iptables -A INPUT -p tcp --dport 3306 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 3306 -j DROP

# 3) Review and reduce high-privilege grants
mysql -uroot -p -e "SELECT user, host FROM mysql.user WHERE Super_priv='Y';"