CVE-2025-50092
📋 TL;DR
This vulnerability in MySQL Server's InnoDB component allows high-privileged attackers with network access to cause denial of service by crashing or hanging the server. It affects MySQL Server 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 Server leading to application downtime and service disruption.
Likely Case
Targeted DoS attacks against vulnerable MySQL instances by malicious insiders or compromised admin accounts.
If Mitigated
Limited impact due to network segmentation and proper privilege management.
🎯 Exploit Status
Oracle describes it as 'easily exploitable' but requires high privileges. No public exploit details available yet.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply Critical Patch Update for July 2025 or later
Vendor Advisory: https://www.oracle.com/security-alerts/cpujul2025.html
Restart Required: Yes
Instructions:
1. Download the appropriate Critical Patch Update from Oracle. 2. Apply the patch following Oracle's MySQL patching procedures. 3. Restart MySQL Server to complete the update.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to MySQL Server to only trusted hosts and applications.
# In MySQL my.cnf/my.ini: bind-address = trusted_ip
# Use firewall: iptables -A INPUT -p tcp --dport 3306 -s trusted_network -j ACCEPT
Privilege Reduction
allReview and minimize accounts with administrative privileges (SUPER, PROCESS, etc.).
SHOW GRANTS FOR 'user'@'host';
REVOKE SUPER ON *.* FROM 'user'@'host';
🧯 If You Can't Patch
- Implement strict network segmentation to isolate MySQL servers from untrusted networks.
- Enforce strong authentication and regularly audit administrative account usage.
🔍 How to Verify
Check if Vulnerable:
Check MySQL version: SELECT VERSION(); If version falls within affected ranges, system is vulnerable.Check Version:
mysql -u root -p -e 'SELECT VERSION();'Verify Fix Applied:
Verify version is updated beyond affected ranges and check Oracle's patch documentation for specific fix verification.📡 Detection & Monitoring
Log Indicators:
- Unexpected MySQL crashes or hangs
- Error logs showing InnoDB-related failures before crash
- Multiple connection attempts from admin accounts followed by service disruption
Network Indicators:
- Multiple protocol connections to MySQL port 3306 from admin accounts
- Unusual traffic patterns preceding service outages
SIEM Query:
source="mysql_error.log" ("crash" OR "hang" OR "shutdown") AND ("InnoDB" OR "privileged")