CVE-2025-50094
📋 TL;DR
This vulnerability in Oracle MySQL Server allows high-privileged attackers with network access to cause denial of service by crashing or hanging the server. It affects MySQL 8.0.42, 8.4.5, and 9.3.0 versions. Attackers need administrative database privileges to exploit this DDL component 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 MySQL server outage causing application downtime and service disruption until server restart.
Likely Case
Targeted DoS attacks against critical MySQL instances by malicious insiders or compromised admin accounts.
If Mitigated
Limited impact due to proper access controls, monitoring, and quick detection of anomalous admin activity.
🎯 Exploit Status
Oracle describes as 'easily exploitable' but requires high privileges. No public exploit details available yet.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply Critical Patch Update from July 2025 or later versions
Vendor Advisory: https://www.oracle.com/security-alerts/cpujul2025.html
Restart Required: Yes
Instructions:
1. Download latest MySQL Critical Patch Update from Oracle. 2. Backup databases. 3. Apply patch following Oracle's upgrade procedures. 4. Restart MySQL service.
🔧 Temporary Workarounds
Restrict Admin Access
allLimit high-privilege accounts to specific IPs and implement least privilege
GRANT ALL PRIVILEGES ON *.* TO 'admin'@'specific_ip' IDENTIFIED BY 'password';
REVOKE SUPER, PROCESS, SHUTDOWN FROM non-essential users;
Network Segmentation
linuxRestrict MySQL port access to application servers only
iptables -A INPUT -p tcp --dport 3306 -s app_server_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 3306 -j DROP
🧯 If You Can't Patch
- Implement strict network access controls to MySQL port (3306 default)
- Monitor for unusual admin activity and failed connection attempts
🔍 How to Verify
Check if Vulnerable:
Run: SELECT VERSION(); and check if output matches 8.0.42, 8.4.5, or 9.3.0Check Version:
mysql --version OR SELECT VERSION();Verify Fix Applied:
Check version after patching is NOT 8.0.42, 8.4.5, or 9.3.0📡 Detection & Monitoring
Log Indicators:
- Multiple connection attempts from admin accounts
- Unexpected server crashes/restarts in error logs
- DDL operation failures
Network Indicators:
- Multiple rapid connections to MySQL port from single source
- Traffic patterns matching DoS attempts
SIEM Query:
source="mysql.log" ("Access denied" OR "crash" OR "shutdown") | stats count by src_ip