CVE-2025-57220
📋 TL;DR
An input validation flaw in the 'ate' service of Tenda AC10 routers allows unauthenticated attackers to send crafted UDP packets to escalate privileges to root. This affects Tenda AC10 v4.0 devices running firmware version 16.03.10.09_multi_TDE01. Attackers can gain complete control of affected routers.
💻 Affected Systems
- Tenda AC10 v4.0
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router with root shell access, allowing traffic interception, DNS manipulation, network pivoting, and persistent backdoor installation.
Likely Case
Router takeover leading to credential theft, man-in-the-middle attacks, and botnet recruitment.
If Mitigated
Limited impact if router is behind firewall with UDP port blocking and network segmentation.
🎯 Exploit Status
Exploit requires sending crafted UDP packets to the 'ate' service port. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None known
Restart Required: Yes
Instructions:
1. Check Tenda support for firmware updates. 2. If update available, download from official Tenda website. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload new firmware file. 6. Wait for router to reboot.
🔧 Temporary Workarounds
Block UDP access to ate service
linuxUse firewall rules to block UDP traffic to the ate service port (typically 29808 or similar)
iptables -A INPUT -p udp --dport 29808 -j DROP
Disable ate service
linuxStop and disable the vulnerable ate service if not needed
killall ate
chmod -x /usr/bin/ate
🧯 If You Can't Patch
- Segment affected routers to isolated network segments
- Implement strict firewall rules blocking all unnecessary UDP ports from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface or via SSH: cat /etc/version | grep 16.03.10.09Check Version:
cat /etc/versionVerify Fix Applied:
Verify firmware version is updated beyond v16.03.10.09_multi_TDE01 and ate service is not running on UDP ports📡 Detection & Monitoring
Log Indicators:
- Unusual UDP connections to high ports
- ate service crash logs
- Privilege escalation attempts in system logs
Network Indicators:
- UDP packets to port 29808 with unusual payloads
- Multiple connection attempts to ate service
SIEM Query:
source="router.logs" AND (udp.dport=29808 OR process="ate")