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CVE-2021-3128

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 lo…

Impact

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.

Affected products

VendorProductAffected versions
AsusZenwifi Ax \(Xt8\) Firmware
before 3.0.0.4.386.42095
before 9.0.0.4.386.41994
AsusRt-Ax3000 Firmware
before 3.0.0.4.386.42095
before 9.0.0.4.386.41994
AsusRt-Ax55 Firmware
before 3.0.0.4.386.42095
before 9.0.0.4.386.41994
AsusRt-Ax56u Firmware
before 3.0.0.4.386.42095
before 9.0.0.4.386.41994
AsusRt-Ax58u Firmware
before 3.0.0.4.386.42095
before 9.0.0.4.386.41994
AsusRt-Ax68u Firmware
before 3.0.0.4.386.42095
before 9.0.0.4.386.41994
AsusRt-Ax82u Firmware
before 3.0.0.4.386.42095
before 9.0.0.4.386.41994
AsusRt-Ax86u Firmware
before 3.0.0.4.386.42095
before 9.0.0.4.386.41994
AsusRt-Ax88u Firmware
before 3.0.0.4.386.42095
before 9.0.0.4.386.41994
AsusRt-Ac66u B1 Firmware
before 3.0.0.4.386.42095
before 9.0.0.4.386.41994
AsusRt-Ac1750 B1 Firmware
before 3.0.0.4.386.42095
before 9.0.0.4.386.41994
AsusRt-Ac1900 Firmware
before 3.0.0.4.386.42095
before 9.0.0.4.386.41994

Weakness classification

CWE-834

References