CVE-2025-50096
📋 TL;DR
This vulnerability in MySQL Server's InnoDB component allows authenticated high-privileged attackers with local access to cause a denial of service (DoS) by crashing or hanging the MySQL Server. It affects Oracle MySQL versions 8.0.0-8.0.42, 8.4.0-8.4.5, and 9.0.0-9.3.0. Attackers need existing high-privileged database access and local system access to exploit this vulnerability.
💻 Affected Systems
- Oracle MySQL Server
📦 What is this software?
Mysql by Oracle
Mysql by Oracle
Mysql by Oracle
⚠️ Risk & Real-World Impact
Worst Case
Complete unavailability of MySQL Server leading to application downtime, data unavailability, and business disruption until service is restored.
Likely Case
Targeted DoS attacks by malicious insiders or compromised high-privileged accounts causing service interruptions.
If Mitigated
Limited impact due to proper access controls, monitoring, and quick recovery procedures.
🎯 Exploit Status
Exploitation requires existing high-privileged database access combined with local system access to the MySQL host.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply Critical Patch Update for July 2025 or later. Check Oracle advisory for specific fixed versions.
Vendor Advisory: https://www.oracle.com/security-alerts/cpujul2025.html
Restart Required: Yes
Instructions:
1. Review Oracle's July 2025 Critical Patch Update advisory. 2. Download appropriate MySQL patch for your version. 3. Apply patch following Oracle's installation instructions. 4. Restart MySQL service. 5. Verify patch application and functionality.
🔧 Temporary Workarounds
Restrict Local Access
allLimit local system access to MySQL hosts to only necessary administrators and services.
# Review and restrict SSH/shell access
# Implement network segmentation
# Use jump hosts for administrative access
Reduce Database Privileges
allApply principle of least privilege to database accounts to minimize high-privileged users.
REVOKE unnecessary privileges from users
CREATE ROLE-based access controls
REGULARLY AUDIT user privileges
🧯 If You Can't Patch
- Implement strict access controls to limit who has local access to MySQL servers
- Enhance monitoring for unusual database activity and implement rapid incident response procedures
🔍 How to Verify
Check if Vulnerable:
Check MySQL version: SELECT VERSION(); If version falls within affected ranges (8.0.0-8.0.42, 8.4.0-8.4.5, 9.0.0-9.3.0), system is vulnerable.Check Version:
mysql -e "SELECT VERSION();"Verify Fix Applied:
After patching: 1. Verify version is outside affected ranges. 2. Test MySQL functionality. 3. Monitor for crashes/hangs.📡 Detection & Monitoring
Log Indicators:
- Unexpected MySQL crashes or hangs in error logs
- Multiple connection failures
- InnoDB crash recovery messages
Network Indicators:
- Sudden drop in database connections
- Application errors indicating database unavailability
SIEM Query:
source="mysql_error.log" AND ("crash" OR "hang" OR "shutdown unexpectedly" OR "InnoDB: Fatal error")