Security advisory

{
  "id": "fa915f8d1244c602148ed97485b6b333a6cae9cf1df675963d1314c0bc2cfc2e",
  "url": "https://osv.dev/vulnerability/CVE-2021-42076",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-42076",
    "summary": "An issue was discovered in Barrier before 2.3.4. An attacker can cause memory exhaustion in the barriers component (aka the server-side implementation of Barrier) and barrierc by sending long TCP messages.",
    "evidence": "osv:CVE-2021-42076",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-42076",
      "aliases": [
        "CVE-2021-42076"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/debauchee/barrier",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c43597c27a4e57b0b599d41360bc4d29bd7bfe48"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:barrier_project:barrier:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.3.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "c43597c27a4e57b0b599d41360bc4d29bd7bfe48"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.3.4"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.3.3",
            "v2.3.2",
            "v2.3.1",
            "v2.3.0",
            "v2.1.2",
            "v2.1.1",
            "v2.1.0",
            "v2.0.0",
            "v2.0.0-RC2",
            "v2.0.0-RC1",
            "v1.8.1-stable",
            "v1.8.0-beta",
            "v1.7.3-stable",
            "v1.7.2-stable",
            "v1.7.1-stable",
            "1.6.2",
            "1.7.0",
            "1.6.3-final",
            "1.6.1",
            "1.6.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-42076.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:03.664001172Z",
      "provider": "osv",
      "references": [
        "https://github.com/debauchee/barrier/releases/tag/v2.3.4"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-42076",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384835,
  "published_at": "2021-11-08T04:15:08.637+00:00"
}