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CVE-2021-23937

Estado: ModificadaAlta (7.5)—

A DNS proxy and possible amplification attack vulnerability in WebClientInfo of Apache Wicket allows an attacker to trigger arbitrary DNS lookups from the server when the X-Forwarded-For header is not properly sanitized. This DNS lookup can be engineered to overload an internal DNS server or to slow down request processing of the Apache Wicket application causing a possible denial of service on either the internal infrastructure or the web application itself. This issue affects Apache Wicket Apache Wicket 9.x version 9.2.0 and prior versions; Apache Wicket 8.x version 8.11.0 and prior versions; Apache Wicket 7.x version 7.17.0 and prior versions and Apache Wicket 6.x version 6.2.0 and later versions.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Apache — Wicket

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-23937",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@apache.org",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache Wicket",
          "versions": [
            {
              "status": "affected",
              "version": "Apache Wicket 9.x",
              "versionType": "custom",
              "lessThanOrEqual": "9.2.0"
            },
            {
              "status": "affected",
              "version": "Apache Wicket 8.x",
              "versionType": "custom",
              "lessThanOrEqual": "8.11.0"
            },
            {
              "status": "affected",
              "version": "Apache Wicket 7.x",
              "versionType": "custom",
              "lessThanOrEqual": "7.17.0"
            },
            {
              "status": "affected",
              "version": "6.2.0",
              "lessThan": "Apache Wicket 6.x*",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-05-25T17:15:08.187",
  "references": [
    {
      "url": "https://lists.apache.org/thread.html/r127c0c1f3cb71e5bc619ad1e4b898b97c49758d1f20a54042966473e%40%3Cannounce.wicket.apache.org%3E",
      "source": "security@apache.org"
    },
    {
      "url": "https://lists.apache.org/thread.html/r127c0c1f3cb71e5bc619ad1e4b898b97c49758d1f20a54042966473e%40%3Cusers.wicket.apache.org%3E",
      "source": "security@apache.org"
    },
    {
      "url": "https://lists.apache.org/thread.html/r8ccbd91b56ebf045d151bd4282bfeea7842a0698a0b76118fca8fe78%40%3Cdev.wicket.apache.org%3E",
      "source": "security@apache.org"
    },
    {
      "url": "https://lists.apache.org/thread.html/rc2ef22f90793e158cef65a7e370cdbca023c499d1403d65feeca870d%40%3Cusers.wicket.apache.org%3E",
      "tags": [
        "Mailing List",
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "security@apache.org"
    },
    {
      "url": "https://lists.apache.org/thread.html/r127c0c1f3cb71e5bc619ad1e4b898b97c49758d1f20a54042966473e%40%3Cannounce.wicket.apache.org%3E",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.apache.org/thread.html/r127c0c1f3cb71e5bc619ad1e4b898b97c49758d1f20a54042966473e%40%3Cusers.wicket.apache.org%3E",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.apache.org/thread.html/r8ccbd91b56ebf045d151bd4282bfeea7842a0698a0b76118fca8fe78%40%3Cdev.wicket.apache.org%3E",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.apache.org/thread.html/rc2ef22f90793e158cef65a7e370cdbca023c499d1403d65feeca870d%40%3Cusers.wicket.apache.org%3E",
      "tags": [
        "Mailing List",
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A DNS proxy and possible amplification attack vulnerability in WebClientInfo of Apache Wicket allows an attacker to trigger arbitrary DNS lookups from the server when the X-Forwarded-For header is not properly sanitized. This DNS lookup can be engineered to overload an internal DNS server or to slow down request processing of the Apache Wicket application causing a possible denial of service on either the internal infrastructure or the web application itself. This issue affects Apache Wicket Apache Wicket 9.x version 9.2.0 and prior versions; Apache Wicket 8.x version 8.11.0 and prior versions; Apache Wicket 7.x version 7.17.0 and prior versions and Apache Wicket 6.x version 6.2.0 and later versions."
    },
    {
      "lang": "es",
      "value": "Un proxy DNS y una posible vulnerabilidad de ataque de amplificación en WebClientInfo de Apache Wicket permiten que un atacante active búsquedas de DNS arbitrarias desde el servidor cuando el encabezado X-Fordered-For no se sanea correctamente. Esta búsqueda de DNS puede ser diseñada para sobrecargar un servidor DNS interno o para ralentizar el procesamiento de peticiones de la aplicación Apache Wicket, lo que provoca una posible Denegación de Servicio en la infraestructura interna o en la propia aplicación web. Este problema afecta a Apache Wicket Apache Wicket 9.x versiones 9.2.0 y anteriores; Apache Wicket 8.x versiones 8.11.0 y anteriores; Apache Wicket 7.x versiones 7.17.0 y anteriores y Apache Wicket 6.x versiones 6.2.0 y posteriores"
    }
  ],
  "lastModified": "2026-06-17T03:39:03.293",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:apache:wicket:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3D5643CD-3063-4900-9EB7-86470C8C1384",
              "versionEndIncluding": "6.2.0",
              "versionStartIncluding": "6.0.0"
            },
            {
              "criteria": "cpe:2.3:a:apache:wicket:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7793CFFA-F876-4DD4-8E2F-C34FBB79FC47",
              "versionEndIncluding": "7.17.0",
              "versionStartIncluding": "7.0.0"
            },
            {
              "criteria": "cpe:2.3:a:apache:wicket:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "02FE0D40-F64F-4EDA-B650-9AB6A13F5190",
              "versionEndIncluding": "8.11.0",
              "versionStartIncluding": "8.0.0"
            },
            {
              "criteria": "cpe:2.3:a:apache:wicket:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A4009313-BE49-4B49-A890-59FDE9D9E0C1",
              "versionEndIncluding": "9.2.0",
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          "operator": "OR"
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    }
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  "sourceIdentifier": "security@apache.org"
}