ASUS
ASUS RT-N66U: aging N900 security
The RT-N66U is an older-generation N900 router for which ASUS has slowed and then stopped security firmware updates.
- Risk level
- High risk
- Category
- Routers and network
- Last reviewed
- 2026-05-23
- Confidence
- medium
Support status
Security support stopped or heavily slowed: check the ASUS changelog for this model.
Typical symptoms
- Firmware on old version
- Telnet access active by default
- ASUSWRT exposed without recent update
Fixes to try
- Install OpenWrt if the model is supported
- Disable Telnet, WAN SSH and remote admin
- Segment the network to isolate critical devices