CVE-2025-50077
📋 TL;DR
This vulnerability in MySQL Server's InnoDB component allows authenticated high-privileged 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 network access and high database privileges 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 server outage causing application downtime and service disruption
Likely Case
Database server crashes requiring restart, causing temporary service interruption
If Mitigated
Limited impact due to proper privilege separation and network segmentation
🎯 Exploit Status
Oracle describes as 'easily exploitable' but requires high privileges
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Oracle Critical Patch Update for July 2025
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. Apply the appropriate patch for your MySQL version. 3. Restart MySQL service. 4. Verify the patch was applied successfully.
🔧 Temporary Workarounds
Restrict Database Privileges
allLimit high-privilege accounts to only necessary users and applications
REVOKE ALL PRIVILEGES ON *.* FROM 'username'@'host';
GRANT SELECT, INSERT, UPDATE, DELETE ON database.* TO 'username'@'host';
Network Segmentation
linuxRestrict network access to MySQL ports (default 3306) to only trusted sources
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 database accounts
- Monitor for unusual database connection patterns or privilege escalation attempts
🔍 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 above affected ranges and check Oracle patch documentation📡 Detection & Monitoring
Log Indicators:
- Unexpected MySQL crashes or restarts
- Multiple high-privilege connection attempts from unusual sources
Network Indicators:
- Multiple connections to MySQL port 3306 followed by service interruption
SIEM Query:
source="mysql.log" ("crash" OR "restart" OR "shutdown") AND ("unexpected" OR "abnormal")