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CVE-2020-27782

Estado: ModificadaAlta (7.5)—

A flaw was found in the Undertow AJP connector. Malicious requests and abrupt connection closes could be triggered by an attacker using query strings with non-RFC compliant characters resulting in a denial of service. The highest threat from this vulnerability is to system availability. This affects Undertow 2.1.5.SP1, 2.0.33.SP2, and 2.2.3.SP1.

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 (3)

Redhat — Jboss FuseRedhat — Openshift Application RuntimesRedhat — Undertow

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2020-27782",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 7.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 6.9,
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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          "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"
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        "impactScore": 3.6,
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  "affected": [
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      "affectedData": [
        {
          "vendor": "n/a",
          "product": "Undertow",
          "versions": [
            {
              "status": "affected",
              "version": "2.1.5.SP1"
            },
            {
              "status": "affected",
              "version": "2.0.33.SP2"
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  "published": "2021-02-23T19:15:13.150",
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      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1901304",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
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  "vulnStatus": "Modified",
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      "source": "secalert@redhat.com",
      "description": [
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          "value": "CWE-400"
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  "descriptions": [
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      "lang": "en",
      "value": "A flaw was found in the Undertow AJP connector. Malicious requests and abrupt connection closes could be triggered by an attacker using query strings with non-RFC compliant characters resulting in a denial of service. The highest threat from this vulnerability is to system availability. This affects Undertow 2.1.5.SP1, 2.0.33.SP2, and 2.2.3.SP1."
    },
    {
      "lang": "es",
      "value": "Se encontró un fallo en el conector AJP de Undertow. Peticiones maliciosas y cierres de conexiones abruptas podrían ser desencadenadas por un atacante usando cadenas de consulta con caracteres que no cumplen con RFC, resultando en una denegación de servicio. La mayor amenaza de esta vulnerabilidad es la disponibilidad del sistema. Esto afecta a Undertow versiones 2.1.5.SP1, 2.0.33.SP2 y 2.2.3.SP1"
    }
  ],
  "lastModified": "2026-06-17T03:09:38.047",
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