CVE-2025-0727
📋 TL;DR
An integer underflow vulnerability in NetX HTTP server functionality of Eclipse ThreadX NetX Duo allows attackers to cause denial of service by sending specially crafted HTTP packets with mismatched Content-Length and data request sizes. This affects all systems using NetX Duo HTTP server functionality before version 6.4.2.
💻 Affected Systems
- Eclipse ThreadX NetX Duo
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete HTTP service disruption leading to unavailability of web services and potential cascading failures in dependent systems.
Likely Case
HTTP service crashes or becomes unresponsive, requiring manual restart of affected services.
If Mitigated
Minimal impact with proper network segmentation and monitoring allowing quick detection and response.
🎯 Exploit Status
Exploitation requires crafting specific HTTP packets but no authentication is needed. The advisory provides technical details but no public exploit code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.4.2
Vendor Advisory: https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-jf6x-9mgc-p72w
Restart Required: Yes
Instructions:
1. Update NetX Duo library to version 6.4.2 or later. 2. Recompile and redeploy applications using the updated library. 3. Restart affected services.
🔧 Temporary Workarounds
Disable HTTP PUT Support
allDisable HTTP PUT method in NetX Duo HTTP server configuration to prevent exploitation.
Modify HTTP server configuration to disable PUT method support
🧯 If You Can't Patch
- Implement network filtering to block HTTP PUT requests to vulnerable systems.
- Deploy web application firewall (WAF) rules to detect and block malicious Content-Length manipulation attempts.
🔍 How to Verify
Check if Vulnerable:
Check NetX Duo library version in your application. If version is below 6.4.2 and HTTP server with PUT support is enabled, the system is vulnerable.Check Version:
Check application build configuration or library headers for NX_DUO_VERSION defineVerify Fix Applied:
Verify NetX Duo library version is 6.4.2 or later and test HTTP PUT functionality with various Content-Length values.📡 Detection & Monitoring
Log Indicators:
- HTTP server crash logs
- Unexpected service restarts
- Error messages related to integer underflow or buffer handling
Network Indicators:
- HTTP PUT requests with mismatched Content-Length and actual data size
- Multiple failed HTTP requests followed by service unavailability
SIEM Query:
source="http_server" AND (event="crash" OR event="restart") AND method="PUT"