CVE-2021-42766 Denial of service in n/a
An adversary can cause a denial of service in the Ethereum Proof-of-Stake consensus protocol by triggering long-range chain reorganizations.
- 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-2021-42766?
CVE-2021-42766 is a critical 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 cause a denial of service (long-range consensus chain reorganizations), even when this adversary has little stake and cannot influence network message propagation. This can cause a protocol stall, or an increase in the profits of individual validators.
Which versions are affected by CVE-2021-42766?
It affects 1 product.
Products include Proof-of-Stake Ethereum Project Proof-of-Stake Ethereum.
How do I fix CVE-2021-42766?
No fix has been published for CVE-2021-42766 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-2021-42766 being exploited?
There is no known exploitation of CVE-2021-42766 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-xh87-56v2-2mrp.