CVE-2021-42765 Denial of service in n/a

High 7.5 Published 20 Oct 2021 Updated 4 Aug 2024

An adversary can cause indefinite stalling of consensus decisions in the Ethereum PoS protocol by leveraging network delays.

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-2021-42765?

CVE-2021-42765 is a high-severity denial of service vulnerability in n/a, published on 20 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The Proof-of-Stake (PoS) Ethereum consensus protocol through 2021-10-19 allows an adversary to leverage network delay to cause a denial of service (indefinite stalling of consensus decisions).

Which versions are affected by CVE-2021-42765?

It affects 1 product.

Products include Proof-of-Stake Ethereum Project Proof-of-Stake Ethereum.

How do I fix CVE-2021-42765?

No fix has been published for CVE-2021-42765 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-2021-42765 being exploited?

There is no known exploitation of CVE-2021-42765 in the wild and no public exploit code.

Sources

Also known as GHSA-vvvf-733g-g5rv.