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 loop can occur that generates excessive network traffic between an affected device and its…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.18% probability · 81th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-834
- Affected
- asus/zenwifi ax \(xt8\) firmware · asus/rt-ax3000 firmware · asus/rt-ax55 firmware · asus/rt-ax56u firmware · asus/rt-ax58u firmware · asus/rt-ax68u firmware · asus/rt-ax82u firmware · asus/rt-ax86u firmware · asus/rt-ax88u firmware · asus/rt-ac66u b1 firmware · asus/rt-ac1750 b1 firmware · asus/rt-ac1900 firmware · asus/rt-ac1900p firmware · asus/rt-ac1900u firmware · asus/rt-ac2900 firmware · asus/rt-ac3100 firmware · asus/rt-ac5300 firmware · asus/rt-ac58u firmware · asus/rt-ac65u firmware · asus/rt-ac68p firmware · +7 more
- Source
- cve@mitre.org
References
- 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/WiFi-6/All-series/RT-AX3000/HelpDesk_BIOS/Product, Vendor Advisory
- https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX55/HelpDesk_BIOS/Product, Vendor Advisory
- https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX56U/HelpDesk_BIOS/Product, Vendor Advisory
- https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX58U/HelpDesk_BIOS/Product, Vendor Advisory
- https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX68U/HelpDesk_BIOS/Product, Vendor Advisory
- https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX82U/HelpDesk_BIOS/Product, Vendor Advisory
- https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX86U/HelpDesk_BIOS/Product, Vendor Advisory
- https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX88U/HelpDesk_BIOS/Product, Vendor Advisory
- https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-WiFi-Routers/RT-AC66U-B1/HelpDesk_Download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC1750_B1/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC1900/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC1900P/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC1900U/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC2900/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC3100/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC5300/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC58U/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC65U/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC68P/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC68R/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC68RW/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC68U/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC68W/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC85U/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC86U/HelpDesk_download/Product, Vendor Advisory
- https://www.asus.com/supportonly/RT-AC88U/HelpDesk_download/Product, 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/WiFi-6/All-series/RT-AX3000/HelpDesk_BIOS/Product, Vendor Advisory
- https://www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX55/HelpDesk_BIOS/Product, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.