CVE-2021-41173: DoS via maliciously crafted p2p message

Severity: low (CVSS 3.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-26 · updated 2026-06-17
Weakness: CWE-20

Description

Go Ethereum is the official Golang implementation of the Ethereum protocol. Prior to version 1.10.9, a vulnerable node is susceptible to crash when processing a maliciously crafted message from a peer. Version v1.10.9 contains patches to the vulnerability. There are no known workarounds aside from upgrading.

Affected products

ethereum go-ethereum: before 1.10.9 — fixed in 1.10.9

How to fix

Upgrade to a fixed version: ethereum go-ethereum 1.10.9. Check the vendor advisory for mitigations.

References

https://github.com/ethereum/go-ethereum/commit/e40b37718326b8b4873b3b00a0db2e6c6d9ea738
https://github.com/ethereum/go-ethereum/pull/23801
https://github.com/ethereum/go-ethereum/releases/tag/v1.10.9
https://github.com/ethereum/go-ethereum/security/advisories/GHSA-59hh-656j-3p7v
https://github.com/ethereum/go-ethereum/commit/e40b37718326b8b4873b3b00a0db2e6c6d9ea738
https://github.com/ethereum/go-ethereum/pull/23801
https://github.com/ethereum/go-ethereum/releases/tag/v1.10.9
https://github.com/ethereum/go-ethereum/security/advisories/GHSA-59hh-656j-3p7v

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