CVE-2025-57069
📋 TL;DR
This vulnerability in Tenda G3 routers allows attackers to cause a Denial of Service (DoS) by sending specially crafted requests that trigger a stack overflow in the getsinglepppuser function. The attack exploits improper bounds checking on the pPppUser parameter. Organizations and individuals using affected Tenda G3 routers are at risk.
💻 Affected Systems
- Tenda G3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router crash requiring physical reboot, potentially disrupting all network connectivity for connected devices.
Likely Case
Router becomes unresponsive, requiring manual reboot to restore functionality, causing temporary network outage.
If Mitigated
If properly segmented and firewalled, impact limited to isolated network segment with minimal business disruption.
🎯 Exploit Status
The vulnerability requires network access to the router's management interface. Exploitation is straightforward once the attack vector is understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware for G3 model. 3. Access router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router after installation.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router management interface
Network segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Implement strict firewall rules to block external access to router management interface (typically port 80/443)
- Monitor router logs for unusual connection attempts or DoS patterns
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or System Tools. If version is v3.0br_V15.11.0.17, the device is vulnerable.Check Version:
Not applicable - check via web interface at http://router_ipVerify Fix Applied:
After firmware update, verify version has changed from v3.0br_V15.11.0.17 to a newer version.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts
- Unusual POST requests to getsinglepppuser endpoint
- Router reboot events without user action
Network Indicators:
- Unusual traffic patterns to router management port
- Multiple connection attempts from single source
SIEM Query:
source="router_logs" AND ("getsinglepppuser" OR "pppuser")