CVE-2025-50101
📋 TL;DR
A vulnerability in MySQL Server's optimizer component allows authenticated high-privilege attackers to cause denial of service by crashing or hanging the server. Affected versions include MySQL 8.0.0-8.0.42, 8.4.0-8.4.5, and 9.0.0-9.3.0. This impacts availability but doesn't allow data theft or unauthorized access.
💻 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
Likely Case
Targeted DoS attacks against MySQL servers by malicious insiders or compromised accounts
If Mitigated
Limited impact due to proper access controls and monitoring
🎯 Exploit Status
CVSS indicates 'easily exploitable' but requires high-privilege authentication. No public exploit details available yet.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Oracle Critical Patch Update for July 2025 for specific fixed versions
Vendor Advisory: https://www.oracle.com/security-alerts/cpujul2025.html
Restart Required: Yes
Instructions:
1. Review Oracle Critical Patch Update Advisory for July 2025. 2. Identify appropriate patch for your MySQL version. 3. Apply patch following Oracle's documentation. 4. Restart MySQL service.
🔧 Temporary Workarounds
Restrict high-privilege access
allLimit accounts with administrative privileges to only necessary users and systems
REVOKE SUPER, PROCESS, SHUTDOWN FROM user@host;
REVOKE ALL PRIVILEGES ON *.* FROM user@host;
Network segmentation
linuxRestrict MySQL network access to only trusted application servers
iptables -A INPUT -p tcp --dport 3306 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 3306 -j DROP
🧯 If You Can't Patch
- Implement strict principle of least privilege for MySQL accounts
- Monitor for unusual connection patterns or privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check MySQL version: SELECT VERSION(); and compare against affected rangesCheck Version:
mysql -e "SELECT VERSION();"Verify Fix Applied:
Verify version is outside affected ranges and check Oracle patch documentation📡 Detection & Monitoring
Log Indicators:
- Unexpected MySQL crashes or restarts
- Multiple failed connection attempts from privileged accounts
- Unusual optimizer-related queries
Network Indicators:
- Multiple connections from single source with high privileges
- Abnormal query patterns preceding crashes
SIEM Query:
source="mysql.log" ("crash" OR "restart" OR "shutdown") AND (user="root" OR user="admin")