CVE-2025-50099
📋 TL;DR
This vulnerability in MySQL Server's InnoDB component allows authenticated high-privilege attackers to cause denial of service by crashing or hanging the database 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 valid high-privilege credentials and network access to exploit this 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 database outage causing application downtime, data unavailability, and business disruption until service is restored.
Likely Case
Database crashes requiring restart, causing temporary service interruption and potential data corruption if transactions are interrupted.
If Mitigated
Minimal impact with proper access controls, monitoring, and quick recovery procedures in place.
🎯 Exploit Status
CVSS indicates 'Easily exploitable' with low attack complexity. Requires high-privilege credentials but no user interaction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply Critical Patch Update from Oracle's July 2025 security alert. Specific fixed versions not specified in provided reference.
Vendor Advisory: https://www.oracle.com/security-alerts/cpujul2025.html
Restart Required: Yes
Instructions:
1. Review Oracle's July 2025 Critical Patch Update advisory. 2. Download appropriate MySQL patch for your version. 3. Apply patch following Oracle's documentation. 4. Restart MySQL service. 5. Verify patch application.
🔧 Temporary Workarounds
Restrict Administrative Access
linuxLimit network access to MySQL administrative interfaces and reduce number of high-privilege accounts.
# Use firewall rules to restrict MySQL port (default 3306) access
iptables -A INPUT -p tcp --dport 3306 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 3306 -j DROP
Implement Least Privilege
allReview and reduce administrative privileges to minimum necessary for operations.
# Review current privileges
SHOW GRANTS FOR 'admin_user'@'%';
# Revoke unnecessary privileges
REVOKE ALL PRIVILEGES ON *.* FROM 'admin_user'@'%';
GRANT SELECT, INSERT, UPDATE, DELETE ON specific_db.* TO 'admin_user'@'%';
🧯 If You Can't Patch
- Implement strict network segmentation to isolate MySQL servers from untrusted networks.
- Enforce strong authentication and credential management for administrative accounts with multi-factor authentication where possible.
🔍 How to Verify
Check if Vulnerable:
Check MySQL version: SELECT VERSION(); If version falls within affected ranges (8.0.0-8.0.42, 8.4.0-8.4.5, 9.0.0-9.3.0), system is vulnerable.Check Version:
mysql -u root -p -e 'SELECT VERSION();'Verify Fix Applied:
After patching, verify version is no longer in vulnerable ranges and test database functionality.📡 Detection & Monitoring
Log Indicators:
- Unexpected MySQL crashes or restarts in error logs
- Multiple failed authentication attempts followed by successful high-privilege login
- Unusual administrative activity patterns
Network Indicators:
- Multiple connections to MySQL port from unusual sources
- Administrative protocol traffic from unauthorized IP addresses
SIEM Query:
source="mysql_error.log" AND ("crash" OR "shutdown" OR "aborted") | stats count by host