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CVE-2021-3128

7.5 HIGH

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...

Published: 2021-04-12 · Last updated: 2026-06-17

Severity and scoring

CVSS
7.5 HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-834

Affected products

VendorProduct
asusrt-ac1750_b1_firmware, rt-ac1900_firmware, rt-ac1900p_firmware

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.

Source: NVD

References

Related CVEs

Same vendor

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  • CVE-2021-3229 — Denial of service in ASUSWRT ASUS RT-AX3000 firmware versions 3.0.0.4.384_10177 and earlier versions allows an attacker to disrupt the us... (7.5 HIGH)
  • CVE-2021-3166 — An issue was discovered on ASUS DSL-N14U-B1 1.1.2.3_805 devices (7.5 HIGH)

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  • CVE-2021-39204 — Pomerium is an open source identity-aware access proxy (7.5 HIGH)
  • CVE-2021-3125 — In TP-Link TL-XDR3230 < 1.0.12, TL-XDR1850 < 1.0.9, TL-XDR1860 < 1.0.14, TL-XDR3250 < 1.0.2, TL-XDR6060 Turbo < 1.1.8, TL-XDR5430 < 1.0.1... (7.5 HIGH)