AUGUST 4, 2026
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Case File

CVE-2021-3128

HIGH · CVSS 7.5 EPSS 2.18%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-04-12 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

CVE
CVE-2021-3128
Severity
HIGH
CVSS
7.5
EPSS
2.18%

Original NVD 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.

Related CVEs

Other vulnerabilities affecting the same vendor(s)