CVE-2021-41436

Name: CVE-2021-41436
Creator: NVD / NIST
Published: 2021-11-19T12:15:09.39+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 4.57%

Last modified Jun 17, 2026

CVE-2021-41436 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An HTTP request smuggling in web application 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 unauthenticated attacker to DoS via sending a specially crafted HTTP packet.. EPSS estimates a 4.57% chance of exploitation in the next 30 days.

Description

An HTTP request smuggling in web application 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 unauthenticated attacker to DoS via sending a specially crafted HTTP packet.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

4.57%

90.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-444

Affected Software

Vendor	Product	Versions
Asus	Gt-Ax11000 Firmware	< 3.0.0.4.386.45898
Asus	Rt-Ax3000 Firmware	< 3.0.0.4.386.45898
Asus	Rt-Ax55 Firmware	< 3.0.0.4.386.45898
Asus	Rt-Ax56u Firmware	< 3.0.0.4.386.45898
Asus	Rt-Ax56u V2 Firmware	< 3.0.0.4.386.45898
Asus	Rt-Ax58u Firmware	< 3.0.0.4.386.45898
Asus	Rt-Ax82u Firmware	< 3.0.0.4.386.45898
Asus	Rt-Ax82u Gundam Edition Firmware	< 3.0.0.4.386.45898
Asus	Rt-Ax86u Firmware	< 3.0.0.4.386.45898
Asus	Rt-Ax86s Firmware	< 3.0.0.4.386.45898
Asus	Rt-Ax86u Zaku Ii Edition Firmware	< 3.0.0.4.386.45898
Asus	Rt-Ax88u Firmware	< 3.0.0.4.386.45898
Asus	Rt-Ax92u Firmware	< 3.0.0.4.386.45898
Asus	Tuf Gaming Ax3000 Firmware	< 3.0.0.4.386.45898
Asus	Tuf-Ax5400 Firmware	< 3.0.0.4.386.45898
Asus	Zenwifi Xd6 Firmware	< 3.0.0.4.386.45898
Asus	Zenwifi Ax \(Xt8\) Firmware	< 3.0.0.4.386.45898
Asus	Rt-Ax68u Firmware	< 3.0.0.4.386.45911

References

http://asus.comVendor Advisory
https://rog.asus.com/networking/rog-rapture-gt-ax11000-model/helpdesk_biosProduct, Vendor Advisory
https://www.asus.com/Networking-IoT-Servers/Whole-Home-Mesh-WiFi-System/ZenWiFi-WiFi-Systems/ASUS-ZenWiFi-AX-XT8-/HelpDesk_BIOS/Product, Vendor Advisory
https://www.asus.com/Networking-IoT-Servers/Whole-Home-Mesh-WiFi-System/ZenWiFi-WiFi-Systems/ASUS-ZenWiFi-XD6/HelpDesk_BIOS/Product, Vendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX3000/HelpDesk_BIOS/Product, Vendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX56U/HelpDesk_BIOS/Product, Vendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX68U/HelpDesk_BIOS/Product, Vendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/All-series/RT-AX55/HelpDesk_BIOS/Product, Vendor Advisory
http://asus.comVendor Advisory
https://rog.asus.com/networking/rog-rapture-gt-ax11000-model/helpdesk_biosProduct, Vendor Advisory
https://www.asus.com/Networking-IoT-Servers/Whole-Home-Mesh-WiFi-System/ZenWiFi-WiFi-Systems/ASUS-ZenWiFi-AX-XT8-/HelpDesk_BIOS/Product, Vendor Advisory
https://www.asus.com/Networking-IoT-Servers/Whole-Home-Mesh-WiFi-System/ZenWiFi-WiFi-Systems/ASUS-ZenWiFi-XD6/HelpDesk_BIOS/Product, Vendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX3000/HelpDesk_BIOS/Product, Vendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX56U/HelpDesk_BIOS/Product, Vendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AX68U/HelpDesk_BIOS/Product, Vendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/All-series/RT-AX55/HelpDesk_BIOS/Product, Vendor Advisory

Timeline

Published: Nov 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41436?

How severe is CVE-2021-41436?

CVE-2021-41436 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.57% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41436?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41436?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST