CVE-2025-53713
📋 TL;DR
A buffer overflow vulnerability in TP-Link TL-WR841N V11 routers allows remote attackers to crash the web service, causing denial-of-service. The vulnerability exists in the /userRpm/WlanNetworkRpm_APC.htm file due to missing input validation. Only users with unsupported V11 models are affected.
💻 Affected Systems
- TP-Link TL-WR841N
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker could potentially execute arbitrary code or cause permanent device failure requiring hardware reset.
Likely Case
Remote attacker causes web service crash leading to temporary DoS until device reboot.
If Mitigated
If device is behind firewall with web interface disabled, impact is minimal.
🎯 Exploit Status
Attack can be launched remotely without authentication via crafted HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://www.tp-link.com/us/support/faq/4569/
Restart Required: No
Instructions:
No official patch available. TP-Link states V11 is end-of-life and recommends upgrading to supported hardware.
🔧 Temporary Workarounds
Disable Remote Management
allDisable web interface access from WAN/Internet to prevent remote exploitation
Access router admin interface > Security > Remote Management > Disable
Restrict Web Interface Access
allLimit web interface access to trusted internal IP addresses only
Access router admin interface > Security > Access Control > Add trusted IP ranges
🧯 If You Can't Patch
- Replace affected V11 routers with supported hardware versions
- Segment affected routers on isolated network segments with strict firewall rules
🔍 How to Verify
Check if Vulnerable:
Check router hardware version label (should show V11) and verify web interface is accessibleCheck Version:
Check physical label on router or login to admin interface > System Tools > Firmware UpgradeVerify Fix Applied:
Verify remote web interface access is disabled and router is on isolated network📡 Detection & Monitoring
Log Indicators:
- Multiple failed HTTP requests to /userRpm/WlanNetworkRpm_APC.htm
- Web service crash/restart logs
Network Indicators:
- Unusual HTTP traffic patterns to router web interface
- Multiple malformed requests to specific endpoint
SIEM Query:
source="router_logs" AND (uri="/userRpm/WlanNetworkRpm_APC.htm" OR message="web service crash")