CVE-2024-2813
📋 TL;DR
This critical vulnerability in Tenda AC15 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the WiFi configuration function. Attackers can exploit this by sending specially crafted SSID parameters to the vulnerable endpoint. All users of affected Tenda AC15 routers with internet-facing administration interfaces are at risk.
💻 Affected Systems
- Tenda AC15
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, network traffic interception, and lateral movement to other devices on the network.
Likely Case
Router takeover allowing attackers to modify DNS settings, intercept traffic, disable security features, or use the device as part of a botnet.
If Mitigated
Limited impact if device is behind firewall with no external access to admin interface, though internal threats remain possible.
🎯 Exploit Status
Exploit details and proof-of-concept are publicly available on GitHub. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Contact Tenda support for firmware updates. Consider replacing affected devices if no patch becomes available.
🔧 Temporary Workarounds
Disable Remote Administration
allPrevent external access to router administration interface
Access router admin panel → Advanced Settings → Remote Management → Disable
Change Default Admin Credentials
allUse strong, unique credentials for router administration
Access router admin panel → System Tools → Modify Login Password
🧯 If You Can't Patch
- Isolate affected routers in separate network segments with strict firewall rules
- Implement network monitoring for unusual traffic patterns or exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface: System Status → Firmware Version. If version is 15.03.20_multi, device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep version or check web interfaceVerify Fix Applied:
Verify firmware has been updated to a version later than 15.03.20_multi. Check that the /goform/fast_setting_wifi_set endpoint properly validates SSID input length.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/fast_setting_wifi_set with long SSID parameters
- Router crash/restart logs
- Failed authentication attempts to admin interface
Network Indicators:
- Unusual outbound connections from router
- DNS hijacking patterns
- Traffic redirection to suspicious IPs
SIEM Query:
source="router_logs" AND (uri="/goform/fast_setting_wifi_set" AND content_length>100) OR (event="buffer_overflow" AND device="Tenda_AC15")🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC15/V1.0%20V15.03.20_multi/form_fast_setting_wifi_set.md
- https://vuldb.com/?ctiid.257668
- https://vuldb.com/?id.257668
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC15/V1.0%20V15.03.20_multi/form_fast_setting_wifi_set.md
- https://vuldb.com/?ctiid.257668
- https://vuldb.com/?id.257668
