CVE-2020-27174: Amazon Firecracker

High severity, CVSS 7.5. EPSS: 1.7% chance of exploitation in the next 30 days.

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.

Affected products

• Amazon Firecracker: before 0.21.3 (fixed in 0.21.3); from 0.22.0, before 0.22.1 (fixed in 0.22.1)

Published 2020-10-16. Last modified 2026-06-17.