CVE-2025-53054: Oracle MySQL Server DOS Vulnerability

CVE-2025-53054 Overview

CVE-2025-53054 is a resource management vulnerability [CWE-400] in the InnoDB component of Oracle MySQL Server. The flaw allows a high-privileged attacker with network access, using multiple protocols, to compromise the server. Successful exploitation results in a complete denial of service through a server hang or repeatable crash. Attackers can also gain unauthorized update, insert, or delete access to a subset of MySQL Server data.

Affected versions include MySQL Server 8.0.0 through 8.0.43, 8.4.0 through 8.4.6, and 9.0.0 through 9.4.0. Oracle addressed the issue in the October 2025 Critical Patch Update.

Critical Impact
An authenticated attacker can crash MySQL Server and tamper with accessible data, disrupting database-backed applications and impacting data integrity.

Affected Products

Oracle MySQL Server 8.0.0 to 8.0.43
Oracle MySQL Server 8.4.0 to 8.4.6
Oracle MySQL Server 9.0.0 to 9.4.0

Discovery Timeline

2025-10-21 - CVE-2025-53054 published to NVD alongside the Oracle October 2025 Critical Patch Update
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-53054

Vulnerability Analysis

The vulnerability resides in the InnoDB storage engine, which handles transactions, indexing, and durable storage in MySQL Server. InnoDB is the default engine for most production deployments, so the flaw affects a broad range of installations. The weakness is classified as uncontrolled resource consumption [CWE-400], indicating that specific operations do not properly bound the resources they allocate or hold.

Exploitation causes MySQL Server to hang or crash repeatedly, producing a full denial of service. Alongside the availability impact, the flaw allows limited unauthorized modification of data accessible to the attacker's session. Read-only confidentiality is not affected because the vector does not permit data disclosure.

The attacker must already hold high privileges within MySQL, such as an account with elevated database roles. Network reachability across MySQL's supported protocols is the only additional prerequisite. No user interaction is required, and the attack complexity is low.

Root Cause

The root cause is improper handling of resource allocation within InnoDB when processing certain queries or transactional operations. When triggered, the condition consumes resources without releasing them, driving the server into an unrecoverable state. Oracle has not published implementation-level details, consistent with its Critical Patch Update disclosure policy.

Attack Vector

Exploitation requires an authenticated session over MySQL's network protocols. The attacker issues crafted requests against InnoDB-backed structures. Repeated invocation produces the hang or crash condition and can also modify data reachable by the compromised account.

No verified proof-of-concept code has been published. Refer to the Oracle Security Alert - October 2025 for the vendor's technical guidance and patch matrix.

Detection Methods for CVE-2025-53054

Indicators of Compromise

Unexplained MySQL Server crashes or hangs in mysqld.log correlating with InnoDB stack traces or assertion failures
Sudden spikes in InnoDB resource metrics such as buffer pool waits, undo log growth, or transaction backlog
Unauthorized UPDATE, INSERT, or DELETE statements originating from high-privileged accounts outside expected maintenance windows
Repeated client sessions from a single principal that immediately precede server restarts

Detection Strategies

Enable the MySQL general query log or audit log to record statements issued by privileged accounts and forward them to a central log platform.
Alert on the mysqld process terminating unexpectedly or restarting outside of change windows.
Baseline InnoDB internal counters via performance_schema and alert on statistically significant deviations.

Monitoring Recommendations

Ingest MySQL error logs, audit logs, and host telemetry into a centralized SIEM for correlation across sessions and hosts.
Track authentication events for high-privilege database accounts and flag logins from unexpected source addresses.
Monitor query patterns for repeated failed or long-running InnoDB operations that precede service disruption.

How to Mitigate CVE-2025-53054

Immediate Actions Required

Apply the Oracle October 2025 Critical Patch Update to all MySQL Server instances running affected 8.0, 8.4, or 9.x versions.
Inventory database accounts with high privileges and revoke roles that exceed operational need.
Restrict network access to MySQL Server through firewalls or security groups so that only trusted application hosts can connect.

Patch Information

Oracle released fixes in the October 2025 Critical Patch Update. Administrators should upgrade to MySQL Server 8.0.44 or later, 8.4.7 or later, or 9.5.0 or later. Consult the Oracle Security Alert - October 2025 for exact patched versions and deployment guidance.

Workarounds

Enforce least privilege for MySQL accounts and remove SUPER, PROCESS, or equivalent roles from application service accounts.
Place MySQL Server behind a bastion or private network segment to eliminate exposure to untrusted networks.
Enable connection rate limiting and account lockouts to slow abuse of compromised credentials.
Maintain tested backups and replication so that a crashed primary can be recovered quickly if exploited.

bash

# Verify installed MySQL Server version and audit privileged accounts
mysql -u root -p -e "SELECT VERSION();"
mysql -u root -p -e "SELECT user, host FROM mysql.user WHERE Super_priv='Y' OR Reload_priv='Y';"