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CVE-2022-39957

Estado: ModificadaAlta (7.5)—

The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass. A client can issue an HTTP Accept header field containing an optional "charset" parameter in order to receive the response in an encoded form. Depending on the "charset", this response can not be decoded by the web application firewall. A restricted resource, access to which would ordinarily be detected, may therefore bypass detection. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised to upgrade to 3.2.2 and 3.3.3 respectively.

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)

Debian — Debian LinuxFedoraproject — FedoraOwasp — Owasp Modsecurity Core Rule SET

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2022-39957",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2022-39957",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-05-29T13:43:57.335368Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "vulnerability@ncsc.ch",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.3,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 3.4,
        "exploitabilityScore": 3.9
      },
      {
        "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:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
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      "source": "vulnerability@ncsc.ch",
      "affectedData": [
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          "vendor": "OWASP",
          "product": "ModSecurity Core Rule Set",
          "versions": [
            {
              "status": "affected",
              "version": "3.0.x"
            },
            {
              "status": "affected",
              "version": "3.1.x"
            },
            {
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom",
              "lessThanOrEqual": "3.2.1"
            },
            {
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom",
              "lessThanOrEqual": "3.3.2"
            }
          ]
        }
      ]
    }
  ],
  "published": "2022-09-20T07:15:12.353",
  "references": [
    {
      "url": "https://coreruleset.org/20220919/crs-version-3-3-3-and-3-2-2-covering-several-cves/",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "vulnerability@ncsc.ch"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2023/01/msg00033.html",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "vulnerability@ncsc.ch"
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HL2L2GF7GOCWPMJZDUE5OXDSXHGG3XUJ/",
      "source": "vulnerability@ncsc.ch"
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PD56EAYNGB6E6QQH62LAYCONOP6OH5DZ/",
      "source": "vulnerability@ncsc.ch"
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YPQ6CCMX3MU4A7MTCGQJA7VMJW3IQDXV/",
      "source": "vulnerability@ncsc.ch"
    },
    {
      "url": "https://security.gentoo.org/glsa/202305-25",
      "source": "vulnerability@ncsc.ch"
    },
    {
      "url": "https://coreruleset.org/20220919/crs-version-3-3-3-and-3-2-2-covering-several-cves/",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
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      "tags": [
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    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HL2L2GF7GOCWPMJZDUE5OXDSXHGG3XUJ/",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://security.gentoo.org/glsa/202305-25",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "vulnerability@ncsc.ch",
      "description": [
        {
          "lang": "en",
          "value": "CWE-693"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-116"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass. A client can issue an HTTP Accept header field containing an optional \"charset\" parameter in order to receive the response in an encoded form. Depending on the \"charset\", this response can not be decoded by the web application firewall. A restricted resource, access to which would ordinarily be detected, may therefore bypass detection. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised to upgrade to 3.2.2 and 3.3.3 respectively."
    },
    {
      "lang": "es",
      "value": "OWASP ModSecurity Core Rule Set (CRS) esta afectado por una omisión del cuerpo de respuesta. Un cliente puede emitir un campo de encabezado HTTP Accept que contenga un parámetro opcional \"charset\" para recibir la respuesta de forma codificada. En función del \"charset\", esta respuesta puede no ser descodificada por el firewall de la aplicación web. Por lo tanto, un recurso restringido, cuyo acceso sería detectado normalmente, puede omitir la detección. Están afectadas las versiones 3.0.x y 3.1.x del CRS heredado, así como las versiones 3.2.1 y 3.3.2 actualmente soportadas. Es recomendado a integradores y usuarios actualizar a versiones 3.2.2 y 3.3.3 respectivamente"
    }
  ],
  "lastModified": "2026-06-17T04:58:35.093",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E9D7A320-7FDD-43B5-92AD-E8EFD58D278E",
              "versionEndExcluding": "3.2.2",
              "versionStartIncluding": "3.0.0"
            },
            {
              "criteria": "cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7D378AD7-0734-4F54-B4FB-975DDF1C80A4",
              "versionEndExcluding": "3.3.3",
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            }
          ],
          "operator": "OR"
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    {
      "nodes": [
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              "vulnerable": true,
              "matchCriteriaId": "80E516C0-98A4-4ADE-B69F-66A772E2BAAA"
            },
            {
              "criteria": "cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5C675112-476C-4D7C-BCB9-A2FB2D0BC9FD"
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              "matchCriteriaId": "E30D0E6F-4AE8-4284-8716-991DFA48CC5D"
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    {
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  "sourceIdentifier": "vulnerability@ncsc.ch"
}