{
  "GSD": {
    "alias": "CVE-2021-27393",
    "description": "A vulnerability has been identified in Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions \u003c V2013.08), Nucleus Source Code (Versions including affected DNS modules). The DNS client does not properly randomize UDP port numbers of DNS requests. That could allow an attacker to poison the DNS cache or spoof DNS resolving.",
    "id": "GSD-2021-27393"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
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      "aliases": [
        "CVE-2021-27393"
      ],
      "details": "A vulnerability has been identified in Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions \u003c V2013.08), Nucleus Source Code (Versions including affected DNS modules). The DNS client does not properly randomize UDP port numbers of DNS requests. That could allow an attacker to poison the DNS cache or spoof DNS resolving.",
      "id": "GSD-2021-27393",
      "modified": "2023-12-13T01:23:35.780529Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "ASSIGNER": "productcert@siemens.com",
        "ID": "CVE-2021-27393",
        "STATE": "PUBLIC"
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      "affects": {
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                    "version": {
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                          "version_value": "All versions"
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                    "product_name": "Nucleus ReadyStart V3",
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                          "version_value": "All versions \u003c V2013.08"
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          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-330: Use of Insufficiently Random Values"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://cert-portal.siemens.com/productcert/pdf/ssa-201384.pdf",
            "refsource": "MISC",
            "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-201384.pdf"
          }
        ]
      }
    },
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        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:siemens:nucleus_net:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
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              {
                "cpe23Uri": "cpe:2.3:a:siemens:nucleus_readystart_v3:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "2013.08",
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      "cve": {
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          "ID": "CVE-2021-27393"
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        "data_version": "4.0",
        "description": {
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              "value": "A vulnerability has been identified in Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions \u003c V2013.08), Nucleus Source Code (Versions including affected DNS modules). The DNS client does not properly randomize UDP port numbers of DNS requests. That could allow an attacker to poison the DNS cache or spoof DNS resolving."
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                "Vendor Advisory"
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              "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-201384.pdf"
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      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 5.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 1.4
        }
      },
      "lastModifiedDate": "2022-04-22T19:38Z",
      "publishedDate": "2021-04-22T21:15Z"
    }
  }
}