PT-2021-23677 · Ethereum · Ethereum Consensus Protocol

Published 2021-10-20 · Updated 2021-10-26 · CVE-2021-42764

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Name of the Vulnerable Software and Affected Versions Ethereum consensus protocol through 2021-10-19

Description The issue allows an adversary to cause a denial of service, resulting in delayed consensus decisions, and also increase the profits of individual validators. This is achieved via short-range reorganizations of the underlying consensus chain.

Recommendations For Ethereum consensus protocol versions through 2021-10-19, consider implementing measures to prevent short-range reorganizations of the consensus chain as a temporary workaround until a more permanent solution is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2021-42764

Affected Products

Ethereum Consensus Protocol

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2021-42764 · Security Note
• https://osv.dev/vulnerability/CVE-2021-42764 · Vendor Advisory
• https://t.me/cibsecurity/30927 · Telegram Post
• https://arxiv.org/abs/2110.10086 · Note