CVE-2025-55085
📋 TL;DR
This vulnerability in NextX Duo's HTTP client module allows a malicious server response to trigger undefined behavior through improper bounds checking when parsing HTTP headers. It affects systems using NextX Duo versions before 6.4.4 that make HTTP requests to untrusted servers. The impact ranges from crashes to potential remote code execution depending on the undefined behavior.
💻 Affected Systems
- NextX Duo (Eclipse Foundation ThreadX network stack)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise if the undefined behavior allows memory corruption exploitation.
Likely Case
Application crashes or denial of service when processing malformed HTTP responses from untrusted servers.
If Mitigated
Limited impact if systems only communicate with trusted servers or have network segmentation preventing exploitation.
🎯 Exploit Status
Exploitation requires the vulnerable system to connect to a malicious server, which could be achieved through DNS poisoning, man-in-the-middle attacks, or social engineering.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.4.4
Vendor Advisory: https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-9c77-rgp9-c2g2
Restart Required: Yes
Instructions:
1. Download NextX Duo version 6.4.4 or later from the official repository. 2. Replace the vulnerable HTTP client module files. 3. Recompile your application with the updated library. 4. Deploy the patched application to affected systems. 5. Restart services or devices using the patched library.
🔧 Temporary Workarounds
Restrict HTTP connections
allConfigure systems to only make HTTP requests to trusted, whitelisted servers
Network segmentation
allIsolate vulnerable systems from untrusted networks using firewalls or network policies
🧯 If You Can't Patch
- Implement strict outbound firewall rules to only allow HTTP connections to trusted servers
- Monitor network traffic for unusual HTTP responses and implement intrusion detection
🔍 How to Verify
Check if Vulnerable:
Check the NextX Duo library version in your application's build configuration or runtime version informationCheck Version:
Check build configuration files or application logs for NextX Duo version informationVerify Fix Applied:
Verify the application is using NextX Duo version 6.4.4 or later and test HTTP client functionality with known good servers📡 Detection & Monitoring
Log Indicators:
- Application crashes or abnormal termination when processing HTTP responses
- Memory access violation errors in system logs
Network Indicators:
- Unusual HTTP traffic patterns to unknown servers
- Malformed HTTP responses being received
SIEM Query:
source="application_logs" AND ("segmentation fault" OR "access violation" OR "undefined behavior") AND process="your_application_name"