CVE-2021-43437

{
  "id": "CVE-2021-43437",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-12-20T20:15:07.660",
  "references": [
    {
      "url": "https://medium.com/%40mayhem7999/cve-2021-43437-5c5e3b977e84",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://portswigger.net/web-security/host-header",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://medium.com/%40mayhem7999/cve-2021-43437-5c5e3b977e84",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://portswigger.net/web-security/host-header",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-74"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In sourcecodetester Engineers Online Portal as of 10-21-21, an attacker can manipulate the Host header as seen by the web application and cause the application to behave in unexpected ways. Very often multiple websites are hosted on the same IP address. This is where the Host Header comes in. This header specifies which website should process the HTTP request. The web server uses the value of this header to dispatch the request to the specified website. Each website hosted on the same IP address is called a virtual host. And It's possible to send requests with arbitrary Host Headers to the first virtual host."
    },
    {
      "lang": "es",
      "value": "En el portal online de sourcecodetester Engineers a partir del 21-10-21, un atacante puede manipular el encabezado Host visualizada por la aplicación web y causar que la aplicación se comporte de forma inesperada. Muy a menudo varios sitios web están alojados en la misma dirección IP. Aquí es donde entra en juego el encabezado Host. Este encabezado especifica qué sitio web debe procesar la petición HTTP. El servidor web usa el valor de este encabezado para enviar la petición al sitio web especifico. Cada sitio web alojado en la misma dirección IP es denominado host virtual. Y es posible enviar peticiones con encabezados de host arbitrarias al primer host virtual"
    }
  ],
  "lastModified": "2026-06-17T04:10:57.690",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:engineers_online_portal_project:engineers_online_portal:1.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EE2C0236-1BC6-45DD-B5A5-1FE81BD75296"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}