CVE-2020-16843: Amazon Firecracker

Medium severity, CVSS 5.9. EPSS: 1.7% chance of exploitation in the next 30 days.

In Firecracker 0.20.x before 0.20.1 and 0.21.x before 0.21.2, the network stack can freeze under heavy ingress traffic. This can result in a denial of service on the microVM when it is configured with a single network interface, and an availability problem for the microVM network interface on which the issue is triggered.

Affected products

• Amazon Firecracker: version 0.20.0 only; version 0.21.0 only; version 0.21.1 only

Published 2020-08-04. Last modified 2026-06-17.