CVE-2025-1814
📋 TL;DR
This critical vulnerability in Tenda AC6 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the /goform/WifiExtraSet endpoint. It affects users of Tenda AC6 firmware version 15.03.05.16, potentially compromising the router's security and connected devices.
💻 Affected Systems
- Tenda AC6
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full device compromise, enabling attackers to intercept traffic, deploy malware, or pivot to internal networks.
Likely Case
Router takeover allowing unauthorized access to network settings, data theft, or denial of service.
If Mitigated
Limited impact if isolated from the internet or patched, but still poses risk if internal threats exist.
🎯 Exploit Status
Exploit details are publicly disclosed, making it easier for attackers to develop and deploy attacks.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
Check Tenda's official website for firmware updates; if available, download and install the latest version via the router's admin interface, then restart the device.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's admin interface to reduce attack surface.
Access router admin panel, navigate to Remote Management settings, and disable it.
Block Access to /goform/WifiExtraSet
linuxUse firewall rules to restrict access to the vulnerable endpoint.
Add iptables rule: iptables -A INPUT -p tcp --dport 80 -m string --string '/goform/WifiExtraSet' --algo bm -j DROP
🧯 If You Can't Patch
- Isolate the router on a separate network segment to limit potential damage.
- Implement network monitoring to detect exploitation attempts and anomalous traffic.
🔍 How to Verify
Check if Vulnerable:
Check the router's firmware version via the admin interface; if it is 15.03.05.16, it is vulnerable.Check Version:
Log into the router's web interface and navigate to System Status or similar section to view firmware version.Verify Fix Applied:
After updating, verify the firmware version has changed from 15.03.05.16 and test for buffer overflow via controlled methods if possible.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/WifiExtraSet with large payloads in router logs.
Network Indicators:
- Suspicious traffic patterns to router's IP on port 80/443 targeting the vulnerable endpoint.
SIEM Query:
source="router_logs" AND url="/goform/WifiExtraSet" AND payload_size>1000