CVE-2025-55495
📋 TL;DR
This buffer overflow vulnerability in Tenda AC6 routers allows attackers to execute arbitrary code by sending specially crafted requests to the fromSetIpMacBind function. It affects users of Tenda AC6 routers running vulnerable firmware versions. Successful exploitation could lead to complete device compromise.
💻 Affected Systems
- Tenda AC6
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full router compromise, credential theft, network traffic interception, and lateral movement to internal systems.
Likely Case
Router crash/reboot causing denial of service, or limited code execution allowing attacker persistence on the router.
If Mitigated
If network segmentation and proper firewall rules are in place, impact limited to router itself without affecting internal network.
🎯 Exploit Status
Proof of concept available on GitHub demonstrates exploitation. Buffer overflow in list parameter suggests straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Tenda support site for firmware updates
2. Download latest firmware for AC6
3. Upload via router admin interface
4. Reboot router after update
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router admin interface
Network segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace vulnerable router with different model/brand
- Implement strict firewall rules blocking all inbound traffic to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is V15.03.06.23_multi, device is vulnerable.Check Version:
Login to router admin interface (typically 192.168.0.1 or 192.168.1.1) and check System Status or Firmware Update sectionVerify Fix Applied:
Verify firmware version has been updated to a version later than V15.03.06.23_multi📡 Detection & Monitoring
Log Indicators:
- Multiple failed requests to fromSetIpMacBind endpoint
- Router crash/reboot logs
- Unusual POST requests with long list parameters
Network Indicators:
- HTTP POST requests to router management interface with abnormally long list parameter values
- Traffic to router on non-standard ports
SIEM Query:
source_ip="router_ip" AND (uri_path="*/fromSetIpMacBind" OR http_method="POST" AND content_length>1000)