CVE-2021-3128 Denial of service in n/a
Attackers can trigger routing loops in ASUS routers using IPv6, causing excessive network traffic and potential service disruption.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-3128?
CVE-2021-3128 is a high-severity denial of service vulnerability in n/a, published on 12 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-834
Which versions are affected by CVE-2021-3128?
It affects 27 products.
Products include 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 and 21 more.
How do I fix CVE-2021-3128?
No fix has been published for CVE-2021-3128 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-3128 being exploited?
There is no known exploitation of CVE-2021-3128 in the wild and no public exploit code.
Sources
Also known as GHSA-289v-jmv7-6xmx.