How severe is CVE-2021-42766?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Proof-Of-Stake Ethereum Project

CVE-2021-42766

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.

EPSS: 0.010 (58.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

Affected products

Proof-of-stake_ethereum_project Proof-of-stake_ethereum
N/a — versions n/a

References

cve@mitre.org (Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-42766?: CVE-2021-42766 is a critical-severity vulnerability in Proof-Of-Stake Ethereum Project. CVSS score: 9.1/10. Published 2021-10-20.
How severe is CVE-2021-42766?: Critical severity. CVSS v3 base score is 9.1 out of 10.