CVE-2020-16843

5.9 mediumEPSS 1.7%

Medium (5.9) in amazon firecracker. 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.

Severity

CVSS 3.1

5.9 medium

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 1.7% chance of exploitation in the next 30 days; higher than 76% of CVEs (scores of 2026-10-31)
Published: 2020-08-04
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

amazon:firecracker

References

http://www.openwall.com/lists/oss-security/2020/08/13/1
https://github.com/firecracker-microvm/firecracker/issues/2057
https://www.openwall.com/lists/oss-security/2020/08/13/1
http://www.openwall.com/lists/oss-security/2020/08/13/1
https://github.com/firecracker-microvm/firecracker/issues/2057

Check your stack JSON