CVE-2025-49482
📋 TL;DR
This CVE describes an improper resource shutdown vulnerability in ASR180x and ASR190x TR069 modules that can lead to resource leaks. The vulnerability affects Falcon_Linux, Kestrel, and Lapwing_Linux systems running versions before v1536. Attackers could potentially exploit this to cause denial of service or system instability.
💻 Affected Systems
- ASR180x
- ASR190x
- Falcon_Linux
- Kestrel
- Lapwing_Linux
📦 What is this software?
Falcon Linux by Asrmicro
Kestrel by Asrmicro
Lapwing Linux by Asrmicro
⚠️ Risk & Real-World Impact
Worst Case
Sustained exploitation could lead to complete resource exhaustion, causing system crashes, denial of service, and potential loss of device management capabilities.
Likely Case
Gradual resource depletion leading to degraded performance, intermittent service disruptions, and increased system instability over time.
If Mitigated
Limited impact with occasional performance degradation that can be managed through monitoring and periodic restarts.
🎯 Exploit Status
Exploitation requires access to TR069 management interface and understanding of resource exhaustion techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1536 or later
Vendor Advisory: https://www.asrmicro.com/en/goods/psirt?cid=40
Restart Required: Yes
Instructions:
1. Download v1536 or later firmware from vendor. 2. Backup current configuration. 3. Apply firmware update following vendor documentation. 4. Reboot device. 5. Verify version and functionality.
🔧 Temporary Workarounds
Disable TR069 if not needed
linuxTemporarily disable TR069 management functionality to eliminate attack surface
# Check vendor documentation for specific TR069 disable commands
Implement resource monitoring and restart
linuxMonitor system resources and schedule periodic restarts to clear potential leaks
# Set up cron job for periodic monitoring and restart if thresholds exceeded
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected devices from untrusted networks
- Deploy rate limiting and connection limits on TR069 management interfaces
🔍 How to Verify
Check if Vulnerable:
Check firmware version and verify if TR069 module is active; versions before v1536 with TR069 enabled are vulnerableCheck Version:
# Check vendor documentation for specific version command (typically varies by device)Verify Fix Applied:
Confirm firmware version is v1536 or later and monitor system resources for stability📡 Detection & Monitoring
Log Indicators:
- Unusual memory or resource consumption patterns
- TR069 process crashes or restarts
- System performance degradation logs
Network Indicators:
- Abnormal TR069 protocol traffic patterns
- Increased connection attempts to TR069 ports
SIEM Query:
source="device_logs" AND ("memory exhaustion" OR "resource leak" OR "tr069 crash")