CVE-2024-53621
📋 TL;DR
A buffer overflow vulnerability in the formSetCfm() function of Tenda AC1206 routers allows attackers to cause Denial of Service (DoS) via specially crafted POST requests. This affects users of Tenda AC1206 1200M routers running vulnerable firmware versions. Attackers can crash the router, disrupting network connectivity.
💻 Affected Systems
- Tenda AC1206 1200M 11ac
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete router crash requiring physical reboot, extended network downtime, potential for remote code execution if buffer overflow can be controlled precisely.
Likely Case
Router becomes unresponsive, requiring reboot to restore functionality, causing temporary network disruption.
If Mitigated
Minimal impact if router is behind firewall with restricted WAN access or if vulnerable interface is disabled.
🎯 Exploit Status
Exploit requires sending crafted POST request to vulnerable endpoint. Public proof-of-concept available in GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. If update available, download and install via web interface. 3. Reboot router after update.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Restrict Web Interface Access
allLimit access to router management interface to trusted IPs only
🧯 If You Can't Patch
- Place router behind firewall with strict inbound rules blocking access to web management ports
- Disable web management interface entirely if not needed, use console/SSH if available
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under System Status or similar sectionCheck Version:
Not applicable - check via web interfaceVerify Fix Applied:
Verify firmware version has been updated to a version newer than US_AC1206V1.0RTL_V15.03.06.23_multi_TD01📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to formSetCfm endpoint
- Router crash/reboot logs
- Unusual traffic to router management interface
Network Indicators:
- Unusual POST requests to router IP on management ports (typically 80/443)
- Router becoming unresponsive to ping
SIEM Query:
source_ip="router_ip" AND (http_method="POST" AND uri="*/formSetCfm" OR event_type="system_reboot")