Security advisory

{
  "id": "f70091bd23224c8c6fcdd04a6acec89b266425f0098ea801342543e62e46642b",
  "url": "https://osv.dev/vulnerability/CVE-2020-28349",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-28349",
    "summary": "An inaccurate frame deduplication process in ChirpStack Network Server 3.9.0 allows a malicious gateway to perform uplink Denial of Service via malformed frequency attributes in CollectAndCallOnceCollect in internal/uplink/collect.go. NOTE: the vendor's position is that there are no \"guarantees that allowing untrusted LoRa gateways to the network should still result in a secure network.",
    "evidence": "osv:CVE-2020-28349",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-28349",
      "aliases": [
        "CVE-2020-28349"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/brocaar/chirpstack-network-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "cabb6b49230f2f3ff25cbc14a992191004c05fad"
                },
                {
                  "last_affected": "cabb6b49230f2f3ff25cbc14a992191004c05fad"
                },
                {
                  "fixed": "874fc1a9b01045ebe8a340f0bb01ed19e8256e60"
                },
                {
                  "fixed": "f996bb0c6c85281b5658f59ff09db1b4a73db453"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:chirpstack:network_server:3.9.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.9.0"
                      },
                      {
                        "last_affected": "3.9.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "874fc1a9b01045ebe8a340f0bb01ed19e8256e60"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f996bb0c6c85281b5658f59ff09db1b4a73db453"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.9.0",
            "v3.9.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-28349.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:04.674158491Z",
      "provider": "osv",
      "references": [
        "https://github.com/brocaar/chirpstack-network-server/commit/874fc1a9b01045ebe8a340f0bb01ed19e8256e60",
        "https://github.com/brocaar/chirpstack-network-server/commit/f996bb0c6c85281b5658f59ff09db1b4a73db453",
        "https://www.cyberark.com/resources/threat-research-blog/lorawan-mqtt-what-to-know-when-securing-your-iot-network"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-28349",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384183,
  "published_at": "2020-11-09T01:15:13.71+00:00"
}