CVE-2025-61581
📋 TL;DR
This CVE describes an Inefficient Regular Expression Complexity (ReDoS) vulnerability in Apache Traffic Control's Traffic Router management interface. Attackers with access to this interface can craft malicious regex patterns that cause denial of service through resource exhaustion. This affects all versions of Apache Traffic Control, which is now retired and unsupported.
💻 Affected Systems
- Apache Traffic Control
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete unavailability of the Traffic Router component, disrupting traffic management and potentially causing cascading failures in dependent systems.
Likely Case
Temporary denial of service affecting the management interface and potentially degrading routing performance.
If Mitigated
Limited impact if access is properly restricted and monitoring detects abnormal resource usage.
🎯 Exploit Status
Exploitation requires access to the management interface. The vulnerability is well-documented in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None available
Vendor Advisory: https://lists.apache.org/thread/mx2jxgnlop2f4vbqnvmrldh4pqmobxvp
Restart Required: No
Instructions:
No official patch exists as the project is retired. The vendor recommends finding an alternative solution or implementing strict access controls.
🔧 Temporary Workarounds
Restrict Management Interface Access
allLimit access to the Traffic Router management interface to trusted IP addresses only.
# Configure firewall rules to restrict access to management interface ports
# Example for Linux iptables: iptables -A INPUT -p tcp --dport <management_port> -s <trusted_ip> -j ACCEPT
# iptables -A INPUT -p tcp --dport <management_port> -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to isolate the Traffic Router management interface
- Monitor system resources (CPU, memory) for abnormal spikes that could indicate exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if you are running Apache Traffic Control and if the Traffic Router management interface is accessible.Check Version:
# Check Apache Traffic Control version: grep -i version /opt/traffic_router/conf/*.properties 2>/dev/null || echo 'Check installation documentation'Verify Fix Applied:
Verify that access controls are properly implemented and the management interface is not exposed to untrusted networks.📡 Detection & Monitoring
Log Indicators:
- Unusual regex pattern submissions in management interface logs
- High CPU usage alerts from the Traffic Router process
- Repeated connection attempts to management interface from unusual sources
Network Indicators:
- Abnormal traffic patterns to Traffic Router management ports
- Multiple requests with complex regex patterns in payloads
SIEM Query:
source="traffic_router.log" AND ("regex" OR "pattern") AND (cpu_usage>90 OR memory_usage>90)