FKIE_CVE-2021-23937
Vulnerability from fkie_nvd - Published: 2021-05-25 17:15 - Updated: 2026-06-17 03:39
Severity
Summary
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.
References
{
"affected": [
{
"affectedData": [
{
"product": "Apache Wicket",
"vendor": "Apache Software Foundation",
"versions": [
{
"lessThanOrEqual": "9.2.0",
"status": "affected",
"version": "Apache Wicket 9.x",
"versionType": "custom"
},
{
"lessThanOrEqual": "8.11.0",
"status": "affected",
"version": "Apache Wicket 8.x",
"versionType": "custom"
},
{
"lessThanOrEqual": "7.17.0",
"status": "affected",
"version": "Apache Wicket 7.x",
"versionType": "custom"
},
{
"lessThan": "Apache Wicket 6.x*",
"status": "affected",
"version": "6.2.0",
"versionType": "custom"
}
]
}
],
"source": "security@apache.org"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:apache:wicket:*:*:*:*:*:*:*:*",
"matchCriteriaId": "3D5643CD-3063-4900-9EB7-86470C8C1384",
"versionEndIncluding": "6.2.0",
"versionStartIncluding": "6.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:apache:wicket:*:*:*:*:*:*:*:*",
"matchCriteriaId": "7793CFFA-F876-4DD4-8E2F-C34FBB79FC47",
"versionEndIncluding": "7.17.0",
"versionStartIncluding": "7.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:apache:wicket:*:*:*:*:*:*:*:*",
"matchCriteriaId": "02FE0D40-F64F-4EDA-B650-9AB6A13F5190",
"versionEndIncluding": "8.11.0",
"versionStartIncluding": "8.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:apache:wicket:*:*:*:*:*:*:*:*",
"matchCriteriaId": "A4009313-BE49-4B49-A890-59FDE9D9E0C1",
"versionEndIncluding": "9.2.0",
"versionStartIncluding": "9.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"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 amplificaci\u00f3n en WebClientInfo de Apache Wicket permiten que un atacante active b\u00fasquedas de DNS arbitrarias desde el servidor cuando el encabezado X-Fordered-For no se sanea correctamente.\u0026#xa0;Esta b\u00fasqueda de DNS puede ser dise\u00f1ada para sobrecargar un servidor DNS interno o para ralentizar el procesamiento de peticiones de la aplicaci\u00f3n Apache Wicket, lo que provoca una posible Denegaci\u00f3n de Servicio en la infraestructura interna o en la propia aplicaci\u00f3n web.\u0026#xa0;Este problema afecta a Apache Wicket Apache Wicket 9.x versiones 9.2.0 y anteriores;\u0026#xa0;Apache Wicket 8.x versiones 8.11.0 y anteriores;\u0026#xa0;Apache Wicket 7.x versiones 7.17.0 y anteriores y Apache Wicket 6.x versiones 6.2.0 y posteriores"
}
],
"id": "CVE-2021-23937",
"lastModified": "2026-06-17T03:39:03.293",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 5.0,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2021-05-25T17:15:08.187",
"references": [
{
"source": "security@apache.org",
"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",
"tags": [
"Mailing List",
"Release Notes",
"Vendor Advisory"
],
"url": "https://lists.apache.org/thread.html/rc2ef22f90793e158cef65a7e370cdbca023c499d1403d65feeca870d%40%3Cusers.wicket.apache.org%3E"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"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",
"tags": [
"Mailing List",
"Release Notes",
"Vendor Advisory"
],
"url": "https://lists.apache.org/thread.html/rc2ef22f90793e158cef65a7e370cdbca023c499d1403d65feeca870d%40%3Cusers.wicket.apache.org%3E"
}
],
"sourceIdentifier": "security@apache.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-200"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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