{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "2.6.4"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "99f7da154e0fc4a494b35d1e74c26d89b934d5bc"
            }
          ],
          "repo": "https://github.com/open5gs/open5gs",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "Open5GS MME versions \u003c= 2.6.4 contain an assertion that can be remotely triggered via a malformed ASN.1 packet over the S1AP interface. An attacker may send a `UE Context Release Complete` message missing a required `MME_UE_S1AP_ID` field to repeatedly crash the MME, resulting in denial of service.",
  "id": "CVE-2023-37020",
  "modified": "2026-03-10T21:49:56.947481169Z",
  "published": "2025-01-22T15:15:11.613Z",
  "references": [
    {
      "type": "EVIDENCE",
      "url": "https://cellularsecurity.org/ransacked"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}