CVE-2025-5869
📋 TL;DR
A critical memory corruption vulnerability exists in RT-Thread's sys_recvfrom function, allowing attackers to execute arbitrary code or cause denial of service. This affects RT-Thread 5.1.0 users who have LWP (Lightweight Process) components enabled. The vulnerability stems from improper handling of the 'from' argument in network socket operations.
💻 Affected Systems
- RT-Thread
📦 What is this software?
Rt Thread by Rt Thread
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or persistent backdoor installation.
Likely Case
Denial of service through system crashes or instability, potentially allowing privilege escalation in multi-user environments.
If Mitigated
Limited impact if systems are isolated, have strict network controls, or lack LWP component usage.
🎯 Exploit Status
Memory corruption vulnerabilities in network functions often lead to reliable exploitation. No public exploit code identified yet.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check RT-Thread GitHub repository for latest patched version
Vendor Advisory: https://github.com/RT-Thread/rt-thread/issues/10304
Restart Required: Yes
Instructions:
1. Monitor RT-Thread GitHub for official patch. 2. Update to patched version when available. 3. Rebuild and redeploy affected systems. 4. Verify LWP component is properly updated.
🔧 Temporary Workarounds
Disable LWP Component
allTemporarily disable Lightweight Process support if not required
Modify RT-Thread configuration to disable LWP component during build
Network Isolation
allRestrict network access to vulnerable systems
Implement firewall rules to limit incoming connections
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to limit exposure
- Monitor systems for abnormal crashes or memory usage patterns
🔍 How to Verify
Check if Vulnerable:
Check RT-Thread version and verify LWP component is enabled in configurationCheck Version:
Check RT-Thread build configuration or version headersVerify Fix Applied:
Verify updated version number and test sys_recvfrom function with boundary cases📡 Detection & Monitoring
Log Indicators:
- System crashes
- Memory allocation errors
- Unexpected process termination
Network Indicators:
- Unusual network traffic patterns to sys_recvfrom function
SIEM Query:
Search for process crashes or memory errors in system logs related to RT-Thread