CVE-2025-25429
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in Trendnet TEW-929DRU routers allows attackers to inject malicious scripts into the device's web interface. When exploited, these scripts execute in the context of authenticated users who view the affected page. This affects all users of vulnerable TEW-929DRU routers with the specific firmware version.
💻 Affected Systems
- Trendnet TEW-929DRU
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could steal administrator credentials, hijack sessions, redirect users to malicious sites, or perform administrative actions on the router without authorization.
Likely Case
Attackers with network access could inject scripts that steal session cookies or redirect users to phishing pages when they access the schedule management interface.
If Mitigated
With proper network segmentation and access controls, the impact is limited to internal network users who access the router's web interface.
🎯 Exploit Status
Exploitation requires access to the router's web interface and knowledge of the vulnerable parameter. The vulnerability is stored/persistent, making it more dangerous than reflected XSS.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check Trendnet's official website for firmware updates. 2. Download the latest firmware for TEW-929DRU. 3. Log into router web interface. 4. Navigate to firmware update section. 5. Upload and apply the new firmware.
🔧 Temporary Workarounds
Disable remote administration
allPrevent external access to router web interface
Log into router interface > Advanced > Remote Management > Disable
Restrict LAN access
allLimit which devices can access router administration
Log into router interface > Advanced > Access Control > Configure allowed IPs
🧯 If You Can't Patch
- Segment router management to isolated VLAN
- Implement web application firewall rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Access router web interface, navigate to /addschedule.htm, attempt to inject script via r_name parameterCheck Version:
Log into router web interface > Status > Firmware VersionVerify Fix Applied:
After firmware update, test the same injection to confirm sanitization📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /addschedule.htm
- JavaScript payloads in URL parameters
Network Indicators:
- Multiple requests to router web interface from single source
- Script tags in HTTP requests
SIEM Query:
source="router_logs" AND (uri="/addschedule.htm" OR param="r_name") AND (content="script" OR content="javascript:")