{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "3.9.0"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "cabb6b49230f2f3ff25cbc14a992191004c05fad"
            },
            {
              "fixed": "874fc1a9b01045ebe8a340f0bb01ed19e8256e60"
            },
            {
              "fixed": "f996bb0c6c85281b5658f59ff09db1b4a73db453"
            }
          ],
          "repo": "https://github.com/brocaar/chirpstack-network-server",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "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.",
  "id": "CVE-2020-28349",
  "modified": "2026-03-13T21:58:24.047140383Z",
  "published": "2020-11-09T01:15:13.710Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/brocaar/chirpstack-network-server/commit/874fc1a9b01045ebe8a340f0bb01ed19e8256e60"
    },
    {
      "type": "FIX",
      "url": "https://github.com/brocaar/chirpstack-network-server/commit/f996bb0c6c85281b5658f59ff09db1b4a73db453"
    },
    {
      "type": "EVIDENCE",
      "url": "https://www.cyberark.com/resources/threat-research-blog/lorawan-mqtt-what-to-know-when-securing-your-iot-network"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}