{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.3.4"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "c43597c27a4e57b0b599d41360bc4d29bd7bfe48"
            }
          ],
          "repo": "https://github.com/debauchee/barrier",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "An issue was discovered in Barrier before 2.3.4. An unauthenticated attacker can cause a segmentation fault in the barriers component (aka the server-side implementation of Barrier) by quickly opening and closing TCP connections while sending a Hello message for each TCP session.",
  "id": "CVE-2021-42074",
  "modified": "2026-03-13T21:47:03.966581777Z",
  "published": "2021-11-08T04:15:08.547Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/debauchee/barrier/releases/tag/v2.3.4"
    },
    {
      "type": "EVIDENCE",
      "url": "http://www.openwall.com/lists/oss-security/2021/11/02/4"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}