CVE-2025-30696
📋 TL;DR
This vulnerability in Oracle MySQL Server's Prepared Statements component allows high-privileged attackers with network access to cause a denial of service by crashing or hanging the MySQL server. It affects MySQL Server versions 8.0.0-8.0.41, 8.4.0-8.4.4, and 9.0.0-9.2.0. 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 service causing application downtime and data inaccessibility until service restart.
Likely Case
Service disruption requiring manual restart of MySQL server, potentially causing brief application downtime.
If Mitigated
Minimal impact if proper privilege separation and network segmentation are implemented.
🎯 Exploit Status
Oracle describes as 'easily exploitable' but requires high-privileged attacker credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply Critical Patch Update for April 2025 or later
Vendor Advisory: https://www.oracle.com/security-alerts/cpuapr2025.html
Restart Required: Yes
Instructions:
1. Download latest MySQL patch from Oracle. 2. Backup databases. 3. Stop MySQL service. 4. Apply patch. 5. Restart MySQL service. 6. Verify version with 'SELECT VERSION();'
🔧 Temporary Workarounds
Restrict administrative privileges
allLimit high-privilege accounts to only necessary users and implement principle of least privilege.
REVOKE SUPER, PROCESS, CREATE USER, SYSTEM_VARIABLES_ADMIN FROM 'username'@'host';
Network segmentation
linuxRestrict network access to MySQL servers to only authorized application servers and management systems.
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 network access controls to limit who can connect to MySQL servers
- Regularly monitor MySQL logs for crash events and implement automated alerting for service disruptions
🔍 How to Verify
Check if Vulnerable:
Run 'SELECT VERSION();' in MySQL and check if version falls within affected ranges.Check Version:
mysql -u root -p -e 'SELECT VERSION();'Verify Fix Applied:
Verify version is outside affected ranges after patching and test prepared statement functionality.📡 Detection & Monitoring
Log Indicators:
- MySQL crash logs
- Unexpected service restarts in system logs
- Error logs showing prepared statement failures
Network Indicators:
- Multiple failed connection attempts from single source followed by service disruption
- Unusual prepared statement traffic patterns
SIEM Query:
source="mysql.log" ("crash" OR "segmentation fault" OR "aborted") AND ("prepared" OR "PS")