CVE-2025-50086
📋 TL;DR
This vulnerability in Oracle MySQL Server's Components Services allows high-privileged attackers with network access to cause denial of service by crashing or hanging the MySQL server. It affects MySQL versions 8.0.0-8.0.42, 8.4.0-8.4.5, and 9.0.0-9.3.0. Attackers need administrative database privileges but can exploit it remotely via multiple protocols.
💻 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 service leading to application downtime, data unavailability, and business disruption.
Likely Case
Targeted DoS attacks against MySQL servers by malicious insiders or compromised admin accounts causing service interruptions.
If Mitigated
Limited impact due to proper access controls, network segmentation, and monitoring preventing unauthorized admin access.
🎯 Exploit Status
CVSS indicates 'easily exploitable' but requires high privilege access. No public exploit details available as of advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply patches from Oracle Critical Patch Update July 2025. Specific fixed versions not specified in CVE description.
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. Download appropriate MySQL patch for your version. 3. Apply patch following Oracle documentation. 4. Restart MySQL service.
🔧 Temporary Workarounds
Restrict Network Access
allLimit MySQL server network exposure to only trusted hosts and applications.
# In MySQL configuration (my.cnf): bind-address = 127.0.0.1
# Or use firewall: sudo ufw deny 3306/tcp
# Or: sudo iptables -A INPUT -p tcp --dport 3306 -j DROP
Principle of Least Privilege
allReview and reduce administrative privileges, implement role-based access control.
# Review users: SELECT user, host FROM mysql.user;
# Revoke unnecessary privileges: REVOKE ALL PRIVILEGES ON *.* FROM 'admin'@'%';
# Create limited privilege accounts for applications.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate MySQL servers from untrusted networks.
- Enhance monitoring and alerting for unauthorized admin access attempts and service crashes.
🔍 How to Verify
Check if Vulnerable:
Check MySQL version: SELECT VERSION(); and compare against affected ranges: 8.0.0-8.0.42, 8.4.0-8.4.5, 9.0.0-9.3.0.Check Version:
mysql -u root -p -e 'SELECT VERSION();'Verify Fix Applied:
After patching, verify version is no longer in affected range and test service stability under normal operations.📡 Detection & Monitoring
Log Indicators:
- Unexpected MySQL service crashes or hangs in error logs
- Multiple failed connection attempts from unusual sources followed by crash
- Admin account login from unexpected IP addresses
Network Indicators:
- Multiple protocol connections to MySQL port 3306 from single source followed by service disruption
- Unusual traffic patterns to MySQL from administrative networks
SIEM Query:
source="mysql_error.log" ("crash" OR "hang" OR "shutdown") AND NOT ("normal" OR "scheduled")