Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2024-03-06 10:55

Modified

2025-05-20 10:02

Summary

Request splitting via HTTP/2 method injection and mod_proxy

Details

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.

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "apache",
        "purl": "pkg:bitnami/apache"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.4.17"
            },
            {
              "fixed": "2.4.49"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-33193"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "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.",
  "id": "BIT-apache-2021-33193",
  "modified": "2025-05-20T10:02:07.006Z",
  "published": "2024-03-06T10:55:40.870Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d%40%3Ccvs.httpd.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70%40%3Ccvs.httpd.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2023/03/msg00002.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/"
    },
    {
      "type": "WEB",
      "url": "https://portswigger.net/research/http2"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/202208-20"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20210917-0004/"
    },
    {
      "type": "WEB",
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
    },
    {
      "type": "WEB",
      "url": "https://www.tenable.com/security/tns-2021-17"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-33193"
    }
  ],
  "schema_version": "1.5.0",
  "summary": "Request splitting via HTTP/2 method injection and mod_proxy"
}

CVE-2021-33193 (GCVE-0-2021-33193)

Vulnerability from cvelistv5 – Published: 2021-08-16 00:00 – Updated: 2024-08-03 23:42

Title

Request splitting via HTTP/2 method injection and mod_proxy

Summary

Severity ?

No CVSS data available.

CWE

Request Splitting

Assigner

apache

References

URL

Tags

	https://portswigger.net/research/http2
	https://github.com/apache/httpd/commit/ecebcc035c…
	https://lists.apache.org/thread.html/re4162adc051…	mailing-list
	https://lists.apache.org/thread.html/ree7519d7141…	mailing-list
	https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
	https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
	https://tools.cisco.com/security/center/content/C…	vendor-advisory
	https://www.oracle.com/security-alerts/cpujan2022.html
	https://security.netapp.com/advisory/ntap-2021091…
	https://www.tenable.com/security/tns-2021-17
	https://www.oracle.com/security-alerts/cpuapr2022.html
	https://security.gentoo.org/glsa/202208-20	vendor-advisory
	https://lists.debian.org/debian-lts-announce/2023…	mailing-list

Impacted products

	Vendor	Product	Version
	Apache Software Foundation	Apache HTTP Server	Affected: Apache HTTP Server 2.4 2.4.17 to 2.4.48

Credits

Reported by James Kettle of PortSwigger

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T23:42:20.253Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://portswigger.net/research/http2"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch"
          },
          {
            "name": "[httpd-cvs] 20210916 [httpd-site] branch main updated: Revert \"Add descriptions for CVE-2021-33193 CVE-2021-36160\"",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d%40%3Ccvs.httpd.apache.org%3E"
          },
          {
            "name": "[httpd-cvs] 20210916 [httpd-site] branch main updated: Add descriptions for CVE-2021-33193 CVE-2021-36160",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70%40%3Ccvs.httpd.apache.org%3E"
          },
          {
            "name": "FEDORA-2021-5d2d4b6ac5",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/"
          },
          {
            "name": "FEDORA-2021-f94985afca",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/"
          },
          {
            "name": "20211124 Multiple Vulnerabilities in Apache HTTP Server Affecting Cisco Products: November 2021",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20210917-0004/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.tenable.com/security/tns-2021-17"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
          },
          {
            "name": "GLSA-202208-20",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202208-20"
          },
          {
            "name": "[debian-lts-announce] 20230303 [SECURITY] [DLA 3351-1] apache2 security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2023/03/msg00002.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Apache HTTP Server",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "status": "affected",
              "version": "Apache HTTP Server 2.4 2.4.17 to 2.4.48"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Reported by James Kettle of PortSwigger"
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "other": "moderate"
            },
            "type": "unknown"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "Request Splitting",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-03-03T00:00:00",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "shortName": "apache"
      },
      "references": [
        {
          "url": "https://portswigger.net/research/http2"
        },
        {
          "url": "https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch"
        },
        {
          "name": "[httpd-cvs] 20210916 [httpd-site] branch main updated: Revert \"Add descriptions for CVE-2021-33193 CVE-2021-36160\"",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d%40%3Ccvs.httpd.apache.org%3E"
        },
        {
          "name": "[httpd-cvs] 20210916 [httpd-site] branch main updated: Add descriptions for CVE-2021-33193 CVE-2021-36160",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70%40%3Ccvs.httpd.apache.org%3E"
        },
        {
          "name": "FEDORA-2021-5d2d4b6ac5",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/"
        },
        {
          "name": "FEDORA-2021-f94985afca",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/"
        },
        {
          "name": "20211124 Multiple Vulnerabilities in Apache HTTP Server Affecting Cisco Products: November 2021",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ"
        },
        {
          "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20210917-0004/"
        },
        {
          "url": "https://www.tenable.com/security/tns-2021-17"
        },
        {
          "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
        },
        {
          "name": "GLSA-202208-20",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202208-20"
        },
        {
          "name": "[debian-lts-announce] 20230303 [SECURITY] [DLA 3351-1] apache2 security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2023/03/msg00002.html"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2021-05-11T00:00:00",
          "value": "reported"
        },
        {
          "lang": "en",
          "time": "2021-08-06T00:00:00",
          "value": "public"
        }
      ],
      "title": "Request splitting via HTTP/2 method injection and mod_proxy",
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2021-33193",
    "datePublished": "2021-08-16T00:00:00",
    "dateReserved": "2021-05-19T00:00:00",
    "dateUpdated": "2024-08-03T23:42:20.253Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

Vulnerability from bitnami_vulndb

CVE-2021-33193 (GCVE-0-2021-33193)

Tags

Sightings

Nomenclature