What’s Vulnerable › Vulnerabilities

CVE-2020-16843

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-08-04 · updated 2026-06-17

Description

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

• AWS Firecracker: 0.20.0, 0.21.0, 0.21.1

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
• https://www.openwall.com/lists/oss-security/2020/08/13/1

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