CVE-2025-53045
📋 TL;DR
This vulnerability allows high-privileged attackers with network access to cause a denial of service (DoS) by crashing or hanging MySQL Server. It affects Oracle MySQL Server versions 8.0.0-8.0.43, 8.4.0-8.4.6, and 9.0.0-9.4.0. Only attackers with administrative database privileges can exploit this vulnerability.
💻 Affected Systems
- Oracle MySQL Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete unavailability of MySQL Server leading to application downtime and service disruption.
Likely Case
Intermittent service disruptions or performance degradation from repeated crash attempts.
If Mitigated
Minimal impact if proper network segmentation and privilege controls prevent unauthorized administrative access.
🎯 Exploit Status
Exploitation requires administrative database privileges and network access. Multiple protocols can be used (MySQL protocol, potentially others).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply patches from Oracle Critical Patch Update October 2025 or later versions
Vendor Advisory: https://www.oracle.com/security-alerts/cpuoct2025.html
Restart Required: No
Instructions:
1. Review Oracle Critical Patch Update October 2025 advisory. 2. Apply appropriate patch for your MySQL version. 3. Test in non-production environment first. 4. Apply to production systems during maintenance window.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit administrative database privileges to only essential personnel and systems
REVOKE SUPER, CREATE USER, GRANT OPTION, SYSTEM_VARIABLES_ADMIN FROM unauthorized_users;
REVOKE ALL PRIVILEGES ON *.* FROM unauthorized_users;
Network Segmentation
allRestrict network access to MySQL Server to only trusted hosts and applications
# In MySQL configuration (my.cnf): bind-address = internal_ip_only
# Use firewall rules: iptables -A INPUT -p tcp --dport 3306 -s trusted_ip -j ACCEPT
🧯 If You Can't Patch
- Implement strict network access controls to limit who can connect to MySQL Server
- Reduce administrative privileges to minimum necessary and implement privilege separation
🔍 How to Verify
Check if Vulnerable:
Check MySQL version: SELECT VERSION(); and compare against affected rangesCheck Version:
mysql -u root -p -e 'SELECT VERSION();'Verify Fix Applied:
Verify version is patched: SELECT VERSION(); should show version above affected ranges📡 Detection & Monitoring
Log Indicators:
- Multiple connection attempts from same administrative user
- MySQL crash logs or abnormal shutdowns
- Error logs showing InnoDB component failures
Network Indicators:
- Unusual traffic patterns to MySQL port from administrative accounts
- Multiple connection resets or timeouts
SIEM Query:
source="mysql.log" AND ("crash" OR "shutdown" OR "InnoDB error") AND time>now()-5m