CVE-2023-30370
📋 TL;DR
CVE-2023-30370 is a critical stack-based buffer overflow vulnerability in Tenda AC15 routers' GetValue function. Attackers can exploit this to execute arbitrary code with root privileges, potentially taking full control of affected devices. This affects all users running vulnerable firmware versions of Tenda AC15 routers.
💻 Affected Systems
- Tenda AC15
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing persistent remote access, credential theft, network pivoting, and botnet recruitment.
Likely Case
Remote code execution leading to router reconfiguration, DNS hijacking, credential harvesting, and network surveillance.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Multiple public GitHub repositories contain exploit code. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V15.03.05.20 or later (check Tenda website for latest)
Vendor Advisory: https://www.tendacn.com/en/
Restart Required: Yes
Instructions:
1. Visit Tenda official website. 2. Download latest firmware for AC15. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external exploitation by disabling WAN access to admin interface
Network Segmentation
allIsolate router management interface to trusted network segments only
🧯 If You Can't Patch
- Replace affected routers with patched or alternative models
- Implement strict firewall rules blocking all inbound traffic to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or System ToolsCheck Version:
Login to router web interface and navigate to System Status pageVerify Fix Applied:
Confirm firmware version is V15.03.05.20 or later after patching📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to router management interface
- Multiple failed exploit attempts
- Unexpected configuration changes
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Port scanning originating from router
SIEM Query:
source_ip=router_ip AND (http_method=POST AND uri_contains="cgi-bin" AND size>threshold)