CVE-2025-53020
📋 TL;DR
This vulnerability in Apache HTTP Server involves improper memory management where memory is released later than intended after its effective lifetime. This affects Apache HTTP Server versions 2.4.17 through 2.4.63, potentially allowing attackers to cause denial of service or other impacts.
💻 Affected Systems
- Apache HTTP Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise
Likely Case
Denial of service through server crashes or instability
If Mitigated
Minimal impact with proper network segmentation and monitoring
🎯 Exploit Status
Memory corruption vulnerabilities can be complex to exploit reliably
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.4.64
Vendor Advisory: https://httpd.apache.org/security/vulnerabilities_24.html
Restart Required: Yes
Instructions:
1. Download Apache HTTP Server 2.4.64 from official sources
2. Stop the Apache service
3. Backup configuration files
4. Install the new version
5. Restore configuration files
6. Start the Apache service
🔧 Temporary Workarounds
Restrict access with firewall rules
linuxLimit Apache server access to trusted networks only
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Implement web application firewall (WAF) with memory corruption protection rules
- Monitor Apache processes for abnormal memory usage patterns
🔍 How to Verify
Check if Vulnerable:
Check Apache version with: httpd -v or apache2 -vCheck Version:
httpd -v 2>&1 | grep 'Server version'Verify Fix Applied:
Verify version is 2.4.64 or higher after patching📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in error_log
- Apache process crashes
- Abnormal memory usage patterns
Network Indicators:
- Unusual HTTP requests causing server instability
- Multiple connection attempts to trigger memory issues
SIEM Query:
source="apache_error_log" AND ("segmentation fault" OR "core dumped" OR "memory fault")