---
id: CVE-2021-41435
title: >-
  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…
summary: >-
  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…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-307
vendor: asus
product: gt-ax11000_firmware
affected:
  - gt-ax11000_firmware < 3.0.0.4.386.45898
  - rt-ax3000_firmware < 3.0.0.4.386.45898
  - rt-ax55_firmware < 3.0.0.4.386.45898
  - rt-ax56u_firmware < 3.0.0.4.386.45898
  - rt-ax56u_v2_firmware < 3.0.0.4.386.45898
  - rt-ax58u_firmware < 3.0.0.4.386.45898
  - rt-ax82u_firmware < 3.0.0.4.386.45898
  - rt-ax82u_gundam_edition_firmware < 3.0.0.4.386.45898
  - rt-ax86u_firmware < 3.0.0.4.386.45898
  - rt-ax86s_firmware < 3.0.0.4.386.45898
  - rt-ax86u_zaku_ii_edition_firmware < 3.0.0.4.386.45898
  - rt-ax88u_firmware < 3.0.0.4.386.45898
  - rt-ax92u_firmware < 3.0.0.4.386.45898
  - tuf_gaming_ax3000_firmware < 3.0.0.4.386.45898
  - tuf-ax5400_firmware < 3.0.0.4.386.45898
  - zenwifi_xd6_firmware < 3.0.0.4.386.45898
  - zenwifi_ax_(xt8)_firmware < 3.0.0.4.386.45898
  - rt-ax68u_firmware < 3.0.0.4.386.45911
patched:
  - gt-ax11000_firmware 3.0.0.4.386.45898
  - rt-ax3000_firmware 3.0.0.4.386.45898
  - rt-ax55_firmware 3.0.0.4.386.45898
  - rt-ax56u_firmware 3.0.0.4.386.45898
  - rt-ax56u_v2_firmware 3.0.0.4.386.45898
  - rt-ax58u_firmware 3.0.0.4.386.45898
  - rt-ax82u_firmware 3.0.0.4.386.45898
  - rt-ax82u_gundam_edition_firmware 3.0.0.4.386.45898
  - rt-ax86u_firmware 3.0.0.4.386.45898
  - rt-ax86s_firmware 3.0.0.4.386.45898
  - rt-ax86u_zaku_ii_edition_firmware 3.0.0.4.386.45898
  - rt-ax88u_firmware 3.0.0.4.386.45898
  - rt-ax92u_firmware 3.0.0.4.386.45898
  - tuf_gaming_ax3000_firmware 3.0.0.4.386.45898
  - tuf-ax5400_firmware 3.0.0.4.386.45898
  - zenwifi_xd6_firmware 3.0.0.4.386.45898
  - zenwifi_ax_(xt8)_firmware 3.0.0.4.386.45898
  - rt-ax68u_firmware 3.0.0.4.386.45911
published: '2021-11-19'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-41435'
references:
  - url: 'https://rog.asus.com/networking/rog-rapture-gt-ax11000-model/helpdesk_bios'
    label: cve@mitre.org
  - url: >-
      https://www.asus.com/Networking-IoT-Servers/Whole-Home-Mesh-WiFi-System/ZenWiFi-WiFi-Systems/ASUS-ZenWiFi-AX-XT8-/HelpDesk_BIOS/
    label: cve@mitre.org
  - url: >-
      https://www.asus.com/Networking-IoT-Servers/Whole-Home-Mesh-WiFi-System/ZenWiFi-WiFi-Systems/ASUS-ZenWiFi-XD6/HelpDesk_BIOS/
    label: cve@mitre.org
  - url: >-
      https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX3000/HelpDesk_BIOS/
    label: cve@mitre.org
  - url: >-
      https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX56U/HelpDesk_BIOS/
    label: cve@mitre.org
  - url: >-
      https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX68U/HelpDesk_BIOS/
    label: cve@mitre.org
  - url: >-
      https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/All-series/RT-AX55/HelpDesk_BIOS/
    label: cve@mitre.org
  - url: 'http://asus.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://rog.asus.com/networking/rog-rapture-gt-ax11000-model/helpdesk_bios'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.asus.com/Networking-IoT-Servers/Whole-Home-Mesh-WiFi-System/ZenWiFi-WiFi-Systems/ASUS-ZenWiFi-AX-XT8-/HelpDesk_BIOS/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.asus.com/Networking-IoT-Servers/Whole-Home-Mesh-WiFi-System/ZenWiFi-WiFi-Systems/ASUS-ZenWiFi-XD6/HelpDesk_BIOS/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX3000/HelpDesk_BIOS/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX56U/HelpDesk_BIOS/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX68U/HelpDesk_BIOS/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/All-series/RT-AX55/HelpDesk_BIOS/
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.06491
epssPercentile: 0.93506
ingestedAt: '2026-07-06T17:03:23.615Z'
---

## Overview

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

- `gt-ax11000_firmware < 3.0.0.4.386.45898`
- `rt-ax3000_firmware < 3.0.0.4.386.45898`
- `rt-ax55_firmware < 3.0.0.4.386.45898`
- `rt-ax56u_firmware < 3.0.0.4.386.45898`
- `rt-ax56u_v2_firmware < 3.0.0.4.386.45898`
- `rt-ax58u_firmware < 3.0.0.4.386.45898`
- `rt-ax82u_firmware < 3.0.0.4.386.45898`
- `rt-ax82u_gundam_edition_firmware < 3.0.0.4.386.45898`
- `rt-ax86u_firmware < 3.0.0.4.386.45898`
- `rt-ax86s_firmware < 3.0.0.4.386.45898`
- `rt-ax86u_zaku_ii_edition_firmware < 3.0.0.4.386.45898`
- `rt-ax88u_firmware < 3.0.0.4.386.45898`
- `rt-ax92u_firmware < 3.0.0.4.386.45898`
- `tuf_gaming_ax3000_firmware < 3.0.0.4.386.45898`
- `tuf-ax5400_firmware < 3.0.0.4.386.45898`
- `zenwifi_xd6_firmware < 3.0.0.4.386.45898`
- `zenwifi_ax_(xt8)_firmware < 3.0.0.4.386.45898`
- `rt-ax68u_firmware < 3.0.0.4.386.45911`

## Remediation

Upgrade past the affected range:

- `gt-ax11000_firmware 3.0.0.4.386.45898`
- `rt-ax3000_firmware 3.0.0.4.386.45898`
- `rt-ax55_firmware 3.0.0.4.386.45898`
- `rt-ax56u_firmware 3.0.0.4.386.45898`
- `rt-ax56u_v2_firmware 3.0.0.4.386.45898`
- `rt-ax58u_firmware 3.0.0.4.386.45898`
- `rt-ax82u_firmware 3.0.0.4.386.45898`
- `rt-ax82u_gundam_edition_firmware 3.0.0.4.386.45898`
- `rt-ax86u_firmware 3.0.0.4.386.45898`
- `rt-ax86s_firmware 3.0.0.4.386.45898`
- `rt-ax86u_zaku_ii_edition_firmware 3.0.0.4.386.45898`
- `rt-ax88u_firmware 3.0.0.4.386.45898`
- `rt-ax92u_firmware 3.0.0.4.386.45898`
- `tuf_gaming_ax3000_firmware 3.0.0.4.386.45898`
- `tuf-ax5400_firmware 3.0.0.4.386.45898`
- `zenwifi_xd6_firmware 3.0.0.4.386.45898`
- `zenwifi_ax_(xt8)_firmware 3.0.0.4.386.45898`
- `rt-ax68u_firmware 3.0.0.4.386.45911`