Security advisory

{
  "id": "81e611368d34f9b99e46d614469607fa40d05950a46aef6dd7cb5a324bfc93f5",
  "url": "https://osv.dev/vulnerability/CVE-2021-27432",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-27432",
    "summary": "OPC Foundation UA .NET Standard versions prior to 1.4.365.48 and OPC UA .NET Legacy are vulnerable to an uncontrolled recursion, which may allow an attacker to trigger a stack overflow.",
    "evidence": "osv:CVE-2021-27432",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-27432",
      "aliases": [
        "CVE-2021-27432"
      ],
      "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/opcfoundation/ua-.netstandard",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "56a54066a19590da7f61b73b98af6a8f09b86bc2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:opcfoundation:ua_.net_standard_stack:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.4.365.48"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.4.365.23",
            "1.4.365.10",
            "1.4.365.2",
            "1.4.363.49",
            "1.4.362.42",
            "1.4.361.39",
            "1.4.360.33",
            "1.4.359.31",
            "1.4.358.30",
            "1.4.357.28",
            "1.4.356.27",
            "1.4.355.26",
            "1.04.354.23",
            "1.04.354.21",
            "1.04.353.15",
            "1.03.350"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-27432.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:22.523298813Z",
      "provider": "osv",
      "references": [
        "https://us-cert.cisa.gov/ics/advisories/icsa-21-133-03"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-27432",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 430703,
  "published_at": "2021-05-20T16:15:07.967+00:00"
}