{
  "id": "CVE-2021-33193",
  "sourceIdentifier": "security@apache.org",
  "published": "2021-08-16T08:15:11.480",
  "lastModified": "2023-11-07T03:35:49.050",
  "vulnStatus": "Modified",
  "descriptions": [
    {
      "lang": "en",
      "value": "A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48."
    },
    {
      "lang": "es",
      "value": "Un m\u00e9todo dise\u00f1ado enviado mediante HTTP/2 omitir\u00e1 la comprobaci\u00f3n y ser\u00e1 reenviado por mod_proxy, lo que puede conllevar a la divisi\u00f3n de peticiones o el envenenamiento de la cach\u00e9. Este problema afecta a Apache HTTP Server versiones 2.4.17 a 2.4.48."
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "cvssMetricV2": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "2.0",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "accessVector": "NETWORK",
          "accessComplexity": "LOW",
          "authentication": "NONE",
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "availabilityImpact": "NONE",
          "baseScore": 5.0
        },
        "baseSeverity": "MEDIUM",
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "acInsufInfo": false,
        "obtainAllPrivilege": false,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "2.4.17",
              "versionEndIncluding": "2.4.48",
              "matchCriteriaId": "C700D9C3-7023-48A7-8A76-70597D99829E"
            }
          ]
        }
      ]
    },
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
              "matchCriteriaId": "A930E247-0B43-43CB-98FF-6CE7B8189835"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*",
              "matchCriteriaId": "80E516C0-98A4-4ADE-B69F-66A772E2BAAA"
            }
          ]
        }
      ]
    },
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:*",
              "versionEndIncluding": "5.19.1",
              "matchCriteriaId": "A686FAF0-1383-4BBB-B7F5-CBCCAB55B356"
            }
          ]
        }
      ]
    },
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:oracle:secure_backup:*:*:*:*:*:*:*:*",
              "versionEndExcluding": "18.1.0.1.0",
              "matchCriteriaId": "C01E8B82-71C7-4A4A-A70A-7B147524AB4A"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*",
              "matchCriteriaId": "D3E503FB-6279-4D4A-91D8-E237ECF9D2B0"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch",
      "source": "security@apache.org",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d%40%3Ccvs.httpd.apache.org%3E",
      "source": "security@apache.org"
    },
    {
      "url": "https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70%40%3Ccvs.httpd.apache.org%3E",
      "source": "security@apache.org"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2023/03/msg00002.html",
      "source": "security@apache.org"
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/",
      "source": "security@apache.org"
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/",
      "source": "security@apache.org"
    },
    {
      "url": "https://portswigger.net/research/http2",
      "source": "security@apache.org",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://security.gentoo.org/glsa/202208-20",
      "source": "security@apache.org",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://security.netapp.com/advisory/ntap-20210917-0004/",
      "source": "security@apache.org",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ",
      "source": "security@apache.org",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.oracle.com/security-alerts/cpuapr2022.html",
      "source": "security@apache.org",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.oracle.com/security-alerts/cpujan2022.html",
      "source": "security@apache.org",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.tenable.com/security/tns-2021-17",
      "source": "security@apache.org",
      "tags": [
        "Third Party Advisory"
      ]
    }
  ]
}