Security advisory

{
  "id": "746b550462812b86188aab750f6bc83abdb55c4bdd2ce18f6e77f53eaa746e69",
  "url": "https://osv.dev/vulnerability/CVE-2021-37592",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-37592",
    "summary": "Suricata before 5.0.8 and 6.x before 6.0.4 allows TCP evasion via a client with a crafted TCP/IP stack that can send a certain sequence of segments.",
    "evidence": "osv:CVE-2021-37592",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-37592",
      "aliases": [
        "CVE-2021-37592"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/oisf/suricata",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "aac67dc8984e3b24f42f4cb399311daae3b9c769"
                },
                {
                  "introduced": "5219691f45ab6c6fb3c3970550dd670c73dbcfa6"
                },
                {
                  "fixed": "e9c8767b905fcae53432076572bfbeaf639b202d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.0.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.0.0"
                      },
                      {
                        "fixed": "6.0.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "suricata-5.0.7",
            "suricata-6.0.3",
            "suricata-5.0.6",
            "suricata-6.0.2",
            "suricata-6.0.1",
            "suricata-5.0.5",
            "suricata-5.0.4",
            "suricata-6.0.0",
            "suricata-5.0.3",
            "suricata-5.0.2",
            "suricata-5.0.1",
            "suricata-5.0.0",
            "suricata-5.0.0-rc1",
            "suricata-5.0.0-beta1",
            "suricata-4.1.2",
            "suricata-4.1.1",
            "suricata-4.1.0",
            "suricata-4.1.0-rc2",
            "suricata-4.1.0-rc1",
            "suricata-4.1.0-beta1",
            "suricata-4.0.1",
            "suricata-4.0.0",
            "suricata-4.0.0-rc2",
            "suricata-4.0.0-rc1",
            "suricata-4.0.0-beta1",
            "suricata-3.2.1",
            "suricata-3.2",
            "suricata-3.2RC1",
            "suricata-3.2beta1",
            "suricata-3.1.2",
            "suricata-3.1.1",
            "suricata-3.1",
            "suricata-3.0.1",
            "suricata-3.1RC1",
            "suricata-3.0.1RC1",
            "suricata-3.0",
            "suricata-3.0RC3",
            "suricata-3.0RC2",
            "suricata-3.0RC1",
            "suricata-2.1beta4",
            "suricata-2.1beta3",
            "suricata-2.1beta2",
            "suricata-2.1beta1",
            "suricata-2.0.2",
            "suricata-2.0.1",
            "suricata-2.0.1rc1",
            "suricata-2.0",
            "suricata-2.0rc3",
            "suricata-2.0rc2",
            "suricata-2.0rc1",
            "suricata-2.0beta2",
            "suricata-2.0beta1",
            "suricata-1.4",
            "suricata-1.4rc1",
            "suricata-1.4beta3",
            "suricata-1.4beta2",
            "suricata-1.4beta1",
            "suricata-1.3.1",
            "suricata-1.3",
            "suricata-1.3rc1",
            "suricata-1.3beta2",
            "suricata-1.3beta1",
            "suricata-1.2.1",
            "suricata-1.2",
            "suricata-1.2rc1",
            "suricata-1.2beta1",
            "suricata-1.1",
            "suricata-1.1rc1",
            "suricata-1.1beta3",
            "suricata-1.1beta2",
            "suricata-1.1beta1",
            "suricata-1.0.2",
            "suricata-1.0.1",
            "suricata-1.0.0",
            "suricata-0.8.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-37592.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:51.202842125Z",
      "provider": "osv",
      "references": [
        "https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942",
        "https://github.com/OISF/suricata/releases",
        "https://redmine.openinfosecfoundation.org/issues/4569"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-37592",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384692,
  "published_at": "2021-11-19T15:15:08.137+00:00"
}