Security advisory

{
  "id": "e8feee7482239d16d872cd2698ed6b1e243061a21d1829c468da297c07a4b008",
  "url": "https://osv.dev/vulnerability/CVE-2020-35471",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-35471",
    "summary": "Envoy before 1.16.1 mishandles dropped and truncated datagrams, as demonstrated by a segmentation fault for a UDP packet size larger than 1500.",
    "evidence": "osv:CVE-2020-35471",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-35471",
      "aliases": [
        "BIT-envoy-2020-35471",
        "CVE-2020-35471"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/envoyproxy/envoy",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0717f49fef0dac3818cd7cdc52bf18e0ae1f7a2c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.16.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.16.0",
            "v1.15.0",
            "v1.14.0",
            "v1.13.0",
            "v1.12.0",
            "v1.11.0",
            "v1.10.0",
            "v1.9.0",
            "v1.8.0",
            "v1.7.0",
            "v1.6.0",
            "v1.5.0",
            "v1.4.0",
            "v1.3.0",
            "v1.2.0",
            "v1.1.0",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-35471.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-35471-373da623",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "131204029759339862986326872176907194143",
                    "8315711033336415069387641955587933397",
                    "180178330427094755049822304876287727863",
                    "154652574641508373041638957818451707934"
                  ]
                },
                "source": "https://github.com/envoyproxy/envoy/commit/0717f49fef0dac3818cd7cdc52bf18e0ae1f7a2c",
                "target": {
                  "file": "source/server/connection_handler_impl.cc"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-35471-4471e0c5",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
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                    "58072314304350740758434783398840774936",
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                    "156095165858063837556317049279107360653",
                    "260460737136737242659349249103925760821",
                    "324980028845647638019925282319855723158",
                    "287840385617234031781812252431680592404",
                    "215831503921888146377477691678125399780"
                  ]
                },
                "source": "https://github.com/envoyproxy/envoy/commit/0717f49fef0dac3818cd7cdc52bf18e0ae1f7a2c",
                "target": {
                  "file": "test/integration/proxy_proto_integration_test.h"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-35471-5bd07ec1",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "317158422460062390569541586553340651141",
                    "188545860483965097382454808649672515013",
                    "87136608404409369736246237155290488473",
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                    "262294055421710382396638433211288245350",
                    "317163328929627490087814819905050249142"
                  ]
                },
                "source": "https://github.com/envoyproxy/envoy/commit/0717f49fef0dac3818cd7cdc52bf18e0ae1f7a2c",
                "target": {
                  "file": "test/integration/proxy_proto_integration_test.cc"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-35471-64c1d30b",
                "digest": {
                  "length": 607,
                  "function_hash": "185610297851602743970956302374790945869"
                },
                "source": "https://github.com/envoyproxy/envoy/commit/0717f49fef0dac3818cd7cdc52bf18e0ae1f7a2c",
                "target": {
                  "file": "test/integration/proxy_proto_integration_test.h",
                  "function": "ProxyProtoIntegrationTest"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:59:38Z"
          }
        }
      ],
      "modified": "2026-10-20T13:59:38.499099840Z",
      "provider": "osv",
      "references": [
        "https://github.com/envoyproxy/envoy/compare/v1.16.0...v1.16.1",
        "https://github.com/envoyproxy/envoy/pull/14122",
        "https://github.com/envoyproxy/envoy/issues/14113"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-35471",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388491,
  "published_at": "2020-12-15T01:15:13.87+00:00"
}