Security advisory

{
  "id": "f233dff1dc20a19a1e774fbf982602fffbbc9f45c123156beef74cc9297583a3",
  "url": "https://osv.dev/vulnerability/CVE-2020-16843",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-16843",
    "summary": "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.",
    "evidence": "osv:CVE-2020-16843",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-16843",
      "aliases": [
        "CVE-2020-16843"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/firecracker-microvm/firecracker",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1374b26f6e94805b23d317831896716232c8454d"
                },
                {
                  "last_affected": "047a379eb041f9ceae35df5fa072d88cac55340e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:amazon:firecracker:0.20.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.20.0"
                      },
                      {
                        "last_affected": "0.20.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:amazon:firecracker:0.21.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.21.0"
                      },
                      {
                        "last_affected": "0.21.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:amazon:firecracker:0.21.1:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.21.1"
                      },
                      {
                        "last_affected": "0.21.1"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.20.0",
            "0.21.0",
            "0.21.1",
            "v0.21.1",
            "v0.20.0",
            "v0.21.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-16843.json"
          }
        }
      ],
      "modified": "2026-10-20T10:51:59.854972376Z",
      "provider": "osv",
      "references": [
        "https://www.openwall.com/lists/oss-security/2020/08/13/1",
        "https://github.com/firecracker-microvm/firecracker/issues/2057"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-16843",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 383192,
  "published_at": "2020-08-04T20:15:12.43+00:00"
}