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CVE-2021-3128 Details

Description

In ASUS RT-AX3000, ZenWiFi AX (XT8), RT-AX88U, and other ASUS routers with firmware < 3.0.0.4.386.42095 or < 9.0.0.4.386.41994, when IPv6 is used, a routing loop can occur that generates excessive network traffic between an affected device and its upstream ISP's router. This occurs when a link prefix route points to a point-to-point link, a destination IPv6 address belongs to the prefix and is not a local IPv6 address, and a router advertisement is received with at least one global unique IPv6 prefix for which the on-link flag is set.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
https://www.asus.com/Networking-IoT-Servers/Whole-Home-Mesh-WiFi-System/ZenWiFi-WiFi-Systems/ASUS-ZenWiFi-AX-XT8-/HelpDesk_BIOS/	CVE	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX3000/HelpDesk_BIOS/	CVE	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX55/HelpDesk_BIOS/	CVE	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX56U/HelpDesk_BIOS/	CVE	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX58U/HelpDesk_BIOS/	CVE	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX68U/HelpDesk_BIOS/	CVE	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX82U/HelpDesk_BIOS/	CVE	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX86U/HelpDesk_BIOS/	CVE	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX88U/HelpDesk_BIOS/	CVE	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AC66U-B1/HelpDesk_Download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC1750_B1/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC1900/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC1900P/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC1900U/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC2900/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC3100/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC5300/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC58U/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC65U/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC68P/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC68R/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC68RW/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC68U/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC68W/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC85U/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC86U/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC88U/HelpDesk_download/	CVE	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/Whole-Home-Mesh-WiFi-System/ZenWiFi-WiFi-Systems/ASUS-ZenWiFi-AX-XT8-/HelpDesk_BIOS/	[email protected]	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX3000/HelpDesk_BIOS/	[email protected]	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX55/HelpDesk_BIOS/	[email protected]	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX56U/HelpDesk_BIOS/	[email protected]	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX58U/HelpDesk_BIOS/	[email protected]	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX68U/HelpDesk_BIOS/	[email protected]	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX82U/HelpDesk_BIOS/	[email protected]	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX86U/HelpDesk_BIOS/	[email protected]	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX88U/HelpDesk_BIOS/	[email protected]	ProductVendor Advisory
https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AC66U-B1/HelpDesk_Download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC1750_B1/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC1900/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC1900P/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC1900U/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC2900/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC3100/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC5300/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC58U/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC65U/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC68P/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC68R/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC68RW/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC68U/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC68W/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC85U/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC86U/HelpDesk_download/	[email protected]	ProductVendor Advisory
https://www.asus.com/supportonly/RT-AC88U/HelpDesk_download/	[email protected]	ProductVendor Advisory

see all 54 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-834	Excessive Iteration	[email protected]

Affected Products

Product	Versions
asus zenwifi ax (xt8) firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:zenwifi_ax_(xt8)_firmware:::::::: Remediation No remediation found in references.
asus zenwifi ax (xt8)	All versions
CPE cpe:2.3:h:asus:zenwifi_ax_(xt8):-:::::::* Remediation No remediation found in references.
asus rt-ax3000 firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ax3000_firmware:::::::: Remediation No remediation found in references.
asus rt-ax3000	All versions
CPE cpe:2.3:h:asus:rt-ax3000:-:::::::* Remediation No remediation found in references.
asus rt-ax55 firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ax55_firmware:::::::: Remediation No remediation found in references.
asus rt-ax55	All versions
CPE cpe:2.3:h:asus:rt-ax55:-:::::::* Remediation No remediation found in references.
asus rt-ax56u firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ax56u_firmware:::::::: Remediation No remediation found in references.
asus rt-ax56u	All versions
CPE cpe:2.3:h:asus:rt-ax56u:-:::::::* Remediation No remediation found in references.
asus rt-ax58u firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ax58u_firmware:::::::: Remediation No remediation found in references.
asus rt-ax58u	All versions
CPE cpe:2.3:h:asus:rt-ax58u:-:::::::* Remediation No remediation found in references.
asus rt-ax68u firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ax68u_firmware:::::::: Remediation No remediation found in references.
asus rt-ax68u	All versions
CPE cpe:2.3:h:asus:rt-ax68u:-:::::::* Remediation No remediation found in references.
asus rt-ax82u firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ax82u_firmware:::::::: Remediation No remediation found in references.
asus rt-ax82u	All versions
CPE cpe:2.3:h:asus:rt-ax82u:-:::::::* Remediation No remediation found in references.
asus rt-ax86u firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ax86u_firmware:::::::: Remediation No remediation found in references.
asus rt-ax86u	All versions
CPE cpe:2.3:h:asus:rt-ax86u:-:::::::* Remediation No remediation found in references.
asus rt-ax88u firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ax88u_firmware:::::::: Remediation No remediation found in references.
asus rt-ax88u	All versions
CPE cpe:2.3:h:asus:rt-ax88u:-:::::::* Remediation No remediation found in references.
asus rt-ac66u b1 firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac66u_b1_firmware:::::::: Remediation No remediation found in references.
asus rt-ac66u b1	All versions
CPE cpe:2.3:h:asus:rt-ac66u_b1:-:::::::* Remediation No remediation found in references.
asus rt-ac1750 b1 firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac1750_b1_firmware:::::::: Remediation No remediation found in references.
asus rt-ac1750 b1	All versions
CPE cpe:2.3:h:asus:rt-ac1750_b1:-:::::::* Remediation No remediation found in references.
asus rt-ac1900 firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac1900_firmware:::::::: Remediation No remediation found in references.
asus rt-ac1900	All versions
CPE cpe:2.3:h:asus:rt-ac1900:-:::::::* Remediation No remediation found in references.
asus rt-ac1900p firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac1900p_firmware:::::::: Remediation No remediation found in references.
asus rt-ac1900p	All versions
CPE cpe:2.3:h:asus:rt-ac1900p:-:::::::* Remediation No remediation found in references.
asus rt-ac1900u firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac1900u_firmware:::::::: Remediation No remediation found in references.
asus rt-ac1900u	All versions
CPE cpe:2.3:h:asus:rt-ac1900u:-:::::::* Remediation No remediation found in references.
asus rt-ac2900 firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac2900_firmware:::::::: Remediation No remediation found in references.
asus rt-ac2900	All versions
CPE cpe:2.3:h:asus:rt-ac2900:-:::::::* Remediation No remediation found in references.
asus rt-ac3100 firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac3100_firmware:::::::: Remediation No remediation found in references.
asus rt-ac3100	All versions
CPE cpe:2.3:h:asus:rt-ac3100:-:::::::* Remediation No remediation found in references.
asus rt-ac5300 firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac5300_firmware:::::::: Remediation No remediation found in references.
asus rt-ac5300	All versions
CPE cpe:2.3:h:asus:rt-ac5300:-:::::::* Remediation No remediation found in references.
asus rt-ac58u firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac58u_firmware:::::::: Remediation No remediation found in references.
asus rt-ac58u	All versions
CPE cpe:2.3:h:asus:rt-ac58u:-:::::::* Remediation No remediation found in references.
asus rt-ac65u firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac65u_firmware:::::::: Remediation No remediation found in references.
asus rt-ac65u	All versions
CPE cpe:2.3:h:asus:rt-ac65u:-:::::::* Remediation No remediation found in references.
asus rt-ac68p firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac68p_firmware:::::::: Remediation No remediation found in references.
asus rt-ac68p	All versions
CPE cpe:2.3:h:asus:rt-ac68p:-:::::::* Remediation No remediation found in references.
asus rt-ac68r firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac68r_firmware:::::::: Remediation No remediation found in references.
asus rt-ac68r	All versions
CPE cpe:2.3:h:asus:rt-ac68r:-:::::::* Remediation No remediation found in references.
asus rt-ac68rw firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac68rw_firmware:::::::: Remediation No remediation found in references.
asus rt-ac68rw	All versions
CPE cpe:2.3:h:asus:rt-ac68rw:-:::::::* Remediation No remediation found in references.
asus rt-ac68u firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac68u_firmware:::::::: Remediation No remediation found in references.
asus rt-ac68u	All versions
CPE cpe:2.3:h:asus:rt-ac68u:-:::::::* Remediation No remediation found in references.
asus rt-ac68w firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac68w_firmware:::::::: Remediation No remediation found in references.
asus rt-ac68w	All versions
CPE cpe:2.3:h:asus:rt-ac68w:-:::::::* Remediation No remediation found in references.
asus rt-ac85u firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac85u_firmware:::::::: Remediation No remediation found in references.
asus rt-ac85u	All versions
CPE cpe:2.3:h:asus:rt-ac85u:-:::::::* Remediation No remediation found in references.
asus rt-ac86u firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac86u_firmware:::::::: Remediation No remediation found in references.
asus rt-ac86u	All versions
CPE cpe:2.3:h:asus:rt-ac86u:-:::::::* Remediation No remediation found in references.
asus rt-ac88u firmware	< 3.0.0.4.386.42095 < 9.0.0.4.386.41994
CPE cpe:2.3:o:asus:rt-ac88u_firmware:::::::: Remediation No remediation found in references.
asus rt-ac88u	All versions
CPE cpe:2.3:h:asus:rt-ac88u:-:::::::* Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Apr 20, 2021	Initial Analysis	[email protected]

CVE-2021-3128 Details

Description

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References to Advisories, Solutions, and Tools

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