{"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":0.93458,"ingestedAt":"2026-07-06T17:03:23.615Z","slug":"CVE-2021-41435","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `gt-ax11000_firmware < 3.0.0.4.386.45898`\n- `rt-ax3000_firmware < 3.0.0.4.386.45898`\n- `rt-ax55_firmware < 3.0.0.4.386.45898`\n- `rt-ax56u_firmware < 3.0.0.4.386.45898`\n- `rt-ax56u_v2_firmware < 3.0.0.4.386.45898`\n- `rt-ax58u_firmware < 3.0.0.4.386.45898`\n- `rt-ax82u_firmware < 3.0.0.4.386.45898`\n- `rt-ax82u_gundam_edition_firmware < 3.0.0.4.386.45898`\n- `rt-ax86u_firmware < 3.0.0.4.386.45898`\n- `rt-ax86s_firmware < 3.0.0.4.386.45898`\n- `rt-ax86u_zaku_ii_edition_firmware < 3.0.0.4.386.45898`\n- `rt-ax88u_firmware < 3.0.0.4.386.45898`\n- `rt-ax92u_firmware < 3.0.0.4.386.45898`\n- `tuf_gaming_ax3000_firmware < 3.0.0.4.386.45898`\n- `tuf-ax5400_firmware < 3.0.0.4.386.45898`\n- `zenwifi_xd6_firmware < 3.0.0.4.386.45898`\n- `zenwifi_ax_(xt8)_firmware < 3.0.0.4.386.45898`\n- `rt-ax68u_firmware < 3.0.0.4.386.45911`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `gt-ax11000_firmware 3.0.0.4.386.45898`\n- `rt-ax3000_firmware 3.0.0.4.386.45898`\n- `rt-ax55_firmware 3.0.0.4.386.45898`\n- `rt-ax56u_firmware 3.0.0.4.386.45898`\n- `rt-ax56u_v2_firmware 3.0.0.4.386.45898`\n- `rt-ax58u_firmware 3.0.0.4.386.45898`\n- `rt-ax82u_firmware 3.0.0.4.386.45898`\n- `rt-ax82u_gundam_edition_firmware 3.0.0.4.386.45898`\n- `rt-ax86u_firmware 3.0.0.4.386.45898`\n- `rt-ax86s_firmware 3.0.0.4.386.45898`\n- `rt-ax86u_zaku_ii_edition_firmware 3.0.0.4.386.45898`\n- `rt-ax88u_firmware 3.0.0.4.386.45898`\n- `rt-ax92u_firmware 3.0.0.4.386.45898`\n- `tuf_gaming_ax3000_firmware 3.0.0.4.386.45898`\n- `tuf-ax5400_firmware 3.0.0.4.386.45898`\n- `zenwifi_xd6_firmware 3.0.0.4.386.45898`\n- `zenwifi_ax_(xt8)_firmware 3.0.0.4.386.45898`\n- `rt-ax68u_firmware 3.0.0.4.386.45911`","depth":"midnight","depthScore":55,"depthScoreParts":{"impact":53.9,"likelihood":1.3,"exploitation":0,"ransomware":0},"changes":[]}