CVE-2021-41435: ASUS Gt-AX11000 Firmware

Critical severity, CVSS 9.8. EPSS: 6.5% chance of exploitation in the next 30 days.

A brute-force protection bypass in CAPTCHA protection in ASUS ROG Rapture GT-AX11000, RT-AX3000, RT-AX55, RT-AX56U, RT-AX56U_V2, RT-AX58U, RT-AX82U, RT-AX82U GUNDAM EDITION, RT-AX86 Series(RT-AX86U/RT-AX86S), RT-AX86U ZAKU II EDITION, RT-AX88U, RT-AX92U, TUF Gaming AX3000, TUF Gaming AX5400 (TUF-AX5400), ASUS ZenWiFi XD6, ASUS ZenWiFi AX (XT8) before 3.0.0.4.386.45898, and RT-AX68U before 3.0.0.4.386.45911, allows a remote attacker to attempt any number of login attempts via sending a specific HTTP request.

Affected products

ASUS Gt-AX11000 Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Rt-AX3000 Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS RT-AX55 Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Rt-AX56U Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Rt-AX56U v2 Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Rt-AX58U Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Rt-AX68U Firmware: before 3.0.0.4.386.45911 (fixed in 3.0.0.4.386.45911)
ASUS Rt-AX82U Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Rt-AX82U Gundam Edition Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Rt-AX86S Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Rt-AX86U Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Rt-AX86U Zaku Ii Edition Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Rt-AX88U Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Rt-AX92U Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Tuf-AX5400 Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Tuf Gaming AX3000 Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Zenwifi Ax (xt8) Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)
ASUS Zenwifi XD6 Firmware: before 3.0.0.4.386.45898 (fixed in 3.0.0.4.386.45898)

Published 2021-11-19. Last modified 2026-07-09.