Vulnerability in ASUS Rt-Ac1750 B1
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.022 (82.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX3000/HelpDesk_BIOS/ (Product, Vendor Advisory)
- www.asus.com/Networking-IoT-Servers/Whole-Home-Mesh-WiFi-System/ZenWiFi-WiFi-Sy… (Product, Vendor Advisory)
- www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX88U/HelpDesk_BIOS/ (Product, Vendor Advisory)
- www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX86U/HelpDesk_BIOS/ (Product, Vendor Advisory)
- www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX82U/HelpDesk_BIOS/ (Product, Vendor Advisory)
- www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX68U/HelpDesk_BIOS/ (Product, Vendor Advisory)
- www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX58U/HelpDesk_BIOS/ (Product, Vendor Advisory)
- www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX56U/HelpDesk_BIOS/ (Product, Vendor Advisory)
- www.asus.com/Networking-IoT-Servers/WiFi-6/All-series/RT-AX55/HelpDesk_BIOS/ (Product, Vendor Advisory)
- www.asus.com/supportonly/RT-AC5300/HelpDesk_download/ (Product, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-3128?
- CVE-2021-3128 is a high-severity vulnerability in ASUS Rt-Ac1750 B1, classified under Excessive Iteration. CVSS score: 7.5/10. Published 2021-04-12.
- How severe is CVE-2021-3128?
- High severity. CVSS v3 base score is 7.5 out of 10.