CVE-2023-27015
📋 TL;DR
This vulnerability in Tenda AC10 routers allows attackers to cause denial of service or execute arbitrary code by exploiting a stack overflow in the sub_4A75C0 function. Attackers can achieve this by sending a specially crafted payload to vulnerable devices. Users of Tenda AC10 routers with the affected firmware version are at risk.
💻 Affected Systems
- Tenda AC10
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing remote code execution, enabling attackers to take full control of the router, intercept network traffic, pivot to internal networks, or install persistent malware.
Likely Case
Router crash causing denial of service, disrupting internet connectivity for all connected devices until manual reboot.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access, though internal attackers could still exploit if network access is available.
🎯 Exploit Status
Detailed technical analysis and proof-of-concept code is publicly available on GitHub, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Tenda official website for firmware updates
2. If update available, download and follow vendor flashing instructions
3. Factory reset after update to ensure clean configuration
4. Verify firmware version after update
🔧 Temporary Workarounds
Network Segmentation
allIsolate router from untrusted networks and restrict WAN access
Disable Remote Management
allTurn off remote administration features to prevent external exploitation
🧯 If You Can't Patch
- Replace vulnerable router with different model or vendor
- Place router behind dedicated firewall with strict ingress filtering
🔍 How to Verify
Check if Vulnerable:
Check router web interface or console for exact firmware version stringCheck Version:
Check router admin interface at 192.168.0.1 or 192.168.1.1 under System StatusVerify Fix Applied:
Verify firmware version no longer matches vulnerable version after update📡 Detection & Monitoring
Log Indicators:
- Router crash/reboot logs
- Unusual traffic patterns to router management interface
- Memory corruption errors in system logs
Network Indicators:
- Malformed packets targeting router management ports
- Unexpected outbound connections from router
SIEM Query:
source="router.logs" AND (event="crash" OR event="reboot" OR message="*overflow*" OR message="*corruption*")