CVE-2025-53062: Oracle MySQL Server InnoDB DOS Vulnerability

CVE-2025-53062 Overview

CVE-2025-53062 is a denial-of-service vulnerability in the InnoDB component of Oracle MySQL Server. The flaw allows a high-privileged attacker with network access to trigger a hang or repeatable crash of the database server. Oracle disclosed the issue in the October 2025 Critical Patch Update. The vulnerability is tracked under CWE-400 (Uncontrolled Resource Consumption) and affects MySQL Server versions 8.0.0 through 8.0.43, 8.4.0 through 8.4.6, and 9.0.0 through 9.4.0.

Critical Impact
Successful exploitation results in a complete denial of service of the MySQL Server instance, disrupting all dependent applications and services.

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-2025-53062 published to NVD following the Oracle October 2025 Critical Patch Update
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-53062

Vulnerability Analysis

The vulnerability resides in the InnoDB storage engine, the default transactional engine for MySQL Server. An authenticated attacker with high privileges can send crafted requests over supported network protocols to induce a server-side condition that consumes resources or triggers an unrecoverable state. The result is a hang or a frequently repeatable crash of the mysqld process, producing a complete denial of service.

The issue is classified as an uncontrolled resource consumption weakness. Confidentiality and integrity of stored data are not directly affected. Only the availability of the database service is impacted. Because InnoDB handles transactional state, indexing, and buffer management, a fault in this component halts all database operations, including replication and connected application workloads.

Root Cause

Oracle has not published detailed root-cause information. The mapping to CWE-400 indicates the underlying defect involves the server failing to properly limit or manage resources when handling a specific InnoDB code path. See the Oracle Critical Patch Update - October 2025 for advisory details.

Attack Vector

Exploitation requires network access to the MySQL Server and valid high-privileged credentials, such as an account with administrative or elevated schema privileges. The attacker submits requests using one of the multiple protocols MySQL supports, such as the classic MySQL protocol or MySQL X Protocol. No user interaction is required. The attack complexity is low, meaning a knowledgeable attacker with valid credentials can reliably reproduce the crash condition. Because the vulnerability is remotely triggerable, exposed MySQL instances with weak administrative credential hygiene face elevated risk.

Detection Methods for CVE-2025-53062

Indicators of Compromise

Repeated mysqld process crashes or restarts recorded in error.log without a corresponding operational cause
Unexpected InnoDB assertion failures, stack traces, or InnoDB: Assertion failure entries in the MySQL error log
Sudden connection storms from a single authenticated user followed by server unresponsiveness
Abnormal spikes in InnoDB buffer pool activity, undo log growth, or memory consumption preceding a crash

Detection Strategies

Monitor MySQL error logs for recurring crash signatures and correlate against authenticated session activity
Enable and review the MySQL general query log or audit log to identify the specific statements that precede a crash
Track mysqld process uptime and alert on unexpected restarts through host telemetry
Baseline high-privileged account activity and alert on statement patterns that deviate from operational norms

Monitoring Recommendations

Ingest MySQL error and audit logs into a centralized analytics platform for correlation with authentication events
Alert on repeated administrative logins from unexpected source addresses or service accounts
Monitor database availability metrics and set thresholds for restart frequency and query latency degradation
Review privileged account inventories quarterly to reduce the population of accounts that can trigger this class of flaw

How to Mitigate CVE-2025-53062

Immediate Actions Required

Apply the fixes from the Oracle October 2025 Critical Patch Update to all affected MySQL Server instances
Inventory MySQL deployments and identify instances running versions 8.0.0-8.0.43, 8.4.0-8.4.6, or 9.0.0-9.4.0
Restrict network exposure of MySQL Server ports (default 3306 and 33060 for X Protocol) to trusted management networks
Audit high-privileged database accounts and rotate credentials that are shared, unused, or overly broad

Patch Information

Oracle addressed CVE-2025-53062 in the October 2025 Critical Patch Update. Upgrade to a fixed release beyond 8.0.43, 8.4.6, or 9.4.0 as published by Oracle. Consult the Oracle Critical Patch Update Advisory for the specific fixed versions applicable to each supported branch, and validate patched builds in a staging environment before production rollout.

Workarounds

Reduce the number of accounts granted administrative privileges such as SUPER, SYSTEM_VARIABLES_ADMIN, or broad ALL PRIVILEGES grants
Place MySQL behind a database firewall or proxy that enforces source-address restrictions for privileged users
Enable the MySQL audit plugin to capture privileged statement activity for forensic review
Configure automatic restart of the mysqld service to reduce the duration of any successful denial-of-service condition until patching is complete

bash

# Configuration example - restrict privileged account network access
# Limit an administrative account to a specific management host
ALTER USER 'admin_user'@'%' RENAME TO 'admin_user'@'10.0.10.25';
FLUSH PRIVILEGES;

# Verify installed MySQL Server version against affected ranges
mysql -u root -p -e "SELECT VERSION();"