CVE-2021-3128
HIGH7.5CVSS v3
5.0CVSS v2
2.48%
EPSS (exploit probability)
CWE-834CWE
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.
CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected routers (3)
| Vendor | Model | Matched via | Affected versions | Fixed in | Patch? |
|---|---|---|---|---|---|
| ASUS | ASUS RT-AX3000 | — |
— | — | No |
| ASUS | ASUS RT-AX88U | — |
— | — | No |
| ASUS | ASUS ZenWiFi XT8 | — |
— | — | No |