Vulnerability-Lookup

FKIE_CVE-2021-44224

Vulnerability from fkie_nvd - Published: 2021-12-20 12:15 - Updated: 2026-06-17 04:12

Severity

8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Summary

A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).

References

URL	Tags
security@apache.org	http://httpd.apache.org/security/vulnerabilities_24.html	Vendor Advisory
security@apache.org	http://seclists.org/fulldisclosure/2022/May/33	Mailing List, Third Party Advisory
security@apache.org	http://seclists.org/fulldisclosure/2022/May/35	Mailing List, Third Party Advisory
security@apache.org	http://seclists.org/fulldisclosure/2022/May/38	Mailing List, Third Party Advisory
security@apache.org	http://www.openwall.com/lists/oss-security/2021/12/20/3	Mailing List, Third Party Advisory
security@apache.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/
security@apache.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/
security@apache.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/
security@apache.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/
security@apache.org	https://security.gentoo.org/glsa/202208-20	Third Party Advisory
security@apache.org	https://security.netapp.com/advisory/ntap-20211224-0001/	Third Party Advisory
security@apache.org	https://support.apple.com/kb/HT213255	Third Party Advisory
security@apache.org	https://support.apple.com/kb/HT213256	Third Party Advisory
security@apache.org	https://support.apple.com/kb/HT213257	Third Party Advisory
security@apache.org	https://www.debian.org/security/2022/dsa-5035	Third Party Advisory
security@apache.org	https://www.oracle.com/security-alerts/cpuapr2022.html	Patch, Third Party Advisory
security@apache.org	https://www.oracle.com/security-alerts/cpujan2022.html	Patch, Third Party Advisory
security@apache.org	https://www.tenable.com/security/tns-2022-01	Third Party Advisory
security@apache.org	https://www.tenable.com/security/tns-2022-03	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://httpd.apache.org/security/vulnerabilities_24.html	Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	http://seclists.org/fulldisclosure/2022/May/33	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://seclists.org/fulldisclosure/2022/May/35	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://seclists.org/fulldisclosure/2022/May/38	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2021/12/20/3	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/
af854a3a-2127-422b-91ae-364da2661108	https://security.gentoo.org/glsa/202208-20	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://security.netapp.com/advisory/ntap-20211224-0001/	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://support.apple.com/kb/HT213255	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://support.apple.com/kb/HT213256	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://support.apple.com/kb/HT213257	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.debian.org/security/2022/dsa-5035	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.oracle.com/security-alerts/cpuapr2022.html	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.oracle.com/security-alerts/cpujan2022.html	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.tenable.com/security/tns-2022-01	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.tenable.com/security/tns-2022-03	Third Party Advisory

Impacted products

Vendor	Product	Version
apache	http_server	*
fedoraproject	fedora	34
fedoraproject	fedora	35
fedoraproject	fedora	36
debian	debian_linux	10.0
debian	debian_linux	11.0
tenable	tenable.sc	*
tenable	tenable.sc	*
oracle	communications_element_manager	*
oracle	communications_operations_monitor	4.0
oracle	communications_operations_monitor	4.3
oracle	communications_operations_monitor	4.4
oracle	communications_operations_monitor	5.0
oracle	communications_session_report_manager	*
oracle	communications_session_route_manager	*
oracle	http_server	-
oracle	http_server	12.2.1.3.0
oracle	http_server	12.2.1.4.0
oracle	instantis_enterprisetrack	17.1
oracle	instantis_enterprisetrack	17.2
oracle	instantis_enterprisetrack	17.3
apple	mac_os_x	10.15.7
apple	mac_os_x	10.15.7
apple	mac_os_x	10.15.7
apple	mac_os_x	10.15.7
apple	mac_os_x	10.15.7
apple	mac_os_x	10.15.7
apple	mac_os_x	10.15.7
apple	mac_os_x	10.15.7
apple	mac_os_x	10.15.7
apple	mac_os_x	10.15.7
apple	mac_os_x	10.15.7
apple	mac_os_x	10.15.7
apple	mac_os_x	10.15.7
apple	macos	*
apple	macos	*
apple	macos	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Apache HTTP Server",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThan": "Apache HTTP Server 2.4*",
              "status": "affected",
              "version": "2.4.7",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security@apache.org"
    }
  ],
  "configurations": [
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    {
      "nodes": [
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          "cpeMatch": [
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          ],
          "negate": false,
          "operator": "OR"
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      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included)."
    },
    {
      "lang": "es",
      "value": "Un URI dise\u00f1ado que es enviado a httpd configurado como proxy directo (ProxyRequests on) puede causar un fallo (desreferencia de puntero NULL) o, en el caso de configuraciones que mezclan declaraciones de proxy directo e inverso, puede permitir que las peticiones se dirijan a un endpoint de socket de dominio Unix declarado (Server Side Request Forgery). Este problema afecta a Apache HTTP Server versiones 2.4.7 hasta 2.4.51 (incluy\u00e9ndola)"
    }
  ],
  "id": "CVE-2021-44224",
  "lastModified": "2026-06-17T04:12:04.890",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 6.4,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 4.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-12-20T12:15:07.393",
  "references": [
    {
      "source": "security@apache.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "http://httpd.apache.org/security/vulnerabilities_24.html"
    },
    {
      "source": "security@apache.org",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://seclists.org/fulldisclosure/2022/May/33"
    },
    {
      "source": "security@apache.org",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://seclists.org/fulldisclosure/2022/May/35"
    },
    {
      "source": "security@apache.org",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://seclists.org/fulldisclosure/2022/May/38"
    },
    {
      "source": "security@apache.org",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2021/12/20/3"
    },
    {
      "source": "security@apache.org",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/"
    },
    {
      "source": "security@apache.org",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/"
    },
    {
      "source": "security@apache.org",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/"
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CVE-2021-44224 (GCVE-0-2021-44224)

Vulnerability from cvelistv5 – Published: 2021-12-20 11:20 – Updated: 2024-08-04 04:17

Title

Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier

Summary

Severity

No CVSS data available.

CWE

CWE-476 - NULL Pointer Dereference

Assigner

apache CNA under the mitre root

CNA scorecard B 76/100 over 1176 records in the last 180 days details

References

19 references

URL	Tags
http://httpd.apache.org/security/vulnerabilities_…	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2021/12/20/3	mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://www.debian.org/security/2022/dsa-5035	vendor-advisoryx_refsource_DEBIAN
https://www.oracle.com/security-alerts/cpujan2022.html	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021122…	x_refsource_CONFIRM
https://www.tenable.com/security/tns-2022-01	x_refsource_CONFIRM
https://www.tenable.com/security/tns-2022-03	x_refsource_CONFIRM
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://www.oracle.com/security-alerts/cpuapr2022.html	x_refsource_MISC
https://support.apple.com/kb/HT213257	x_refsource_CONFIRM
https://support.apple.com/kb/HT213256	x_refsource_CONFIRM
https://support.apple.com/kb/HT213255	x_refsource_CONFIRM
http://seclists.org/fulldisclosure/2022/May/33	mailing-listx_refsource_FULLDISC
http://seclists.org/fulldisclosure/2022/May/35	mailing-listx_refsource_FULLDISC
http://seclists.org/fulldisclosure/2022/May/38	mailing-listx_refsource_FULLDISC
https://security.gentoo.org/glsa/202208-20	vendor-advisoryx_refsource_GENTOO

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache HTTP Server	Affected: 2.4.7 , < Apache HTTP Server 2.4* (custom)

Credits

漂亮鼠 TengMA(@Te3t123)

Show details on NVD website

JSON

To clipboard

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              "lang": "eng",
              "value": "A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included)."
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                  "value": "CWE-476 NULL Pointer Dereference"
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              ]
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          ]
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        "references": {
          "reference_data": [
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              "name": "http://httpd.apache.org/security/vulnerabilities_24.html",
              "refsource": "MISC",
              "url": "http://httpd.apache.org/security/vulnerabilities_24.html"
            },
            {
              "name": "[oss-security] 20211220 CVE-2021-44224: Apache HTTP Server: Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2021/12/20/3"
            },
            {
              "name": "FEDORA-2021-29a536c2ae",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/"
            },
            {
              "name": "DSA-5035",
              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2022/dsa-5035"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpujan2022.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20211224-0001/",
              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20211224-0001/"
            },
            {
              "name": "https://www.tenable.com/security/tns-2022-01",
              "refsource": "CONFIRM",
              "url": "https://www.tenable.com/security/tns-2022-01"
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              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/"
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            {
              "name": "FEDORA-2022-78e3211c55",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpuapr2022.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
            },
            {
              "name": "https://support.apple.com/kb/HT213257",
              "refsource": "CONFIRM",
              "url": "https://support.apple.com/kb/HT213257"
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              "name": "https://support.apple.com/kb/HT213256",
              "refsource": "CONFIRM",
              "url": "https://support.apple.com/kb/HT213256"
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              "name": "https://support.apple.com/kb/HT213255",
              "refsource": "CONFIRM",
              "url": "https://support.apple.com/kb/HT213255"
            },
            {
              "name": "20220516 APPLE-SA-2022-05-16-4 Security Update 2022-004 Catalina",
              "refsource": "FULLDISC",
              "url": "http://seclists.org/fulldisclosure/2022/May/33"
            },
            {
              "name": "20220516 APPLE-SA-2022-05-16-3 macOS Big Sur 11.6.6",
              "refsource": "FULLDISC",
              "url": "http://seclists.org/fulldisclosure/2022/May/35"
            },
            {
              "name": "20220516 APPLE-SA-2022-05-16-2 macOS Monterey 12.4",
              "refsource": "FULLDISC",
              "url": "http://seclists.org/fulldisclosure/2022/May/38"
            },
            {
              "name": "GLSA-202208-20",
              "refsource": "GENTOO",
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            "time": "2021-11-18T00:00:00.000Z",
            "value": "Reported to security team"
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          {
            "lang": "en",
            "time": "2021-12-14T00:00:00.000Z",
            "value": "fixed by r1895955+r1896044 in 2.4.x"
          }
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  "cveMetadata": {
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    "assignerShortName": "apache",
    "cveId": "CVE-2021-44224",
    "datePublished": "2021-12-20T11:20:13.000Z",
    "dateReserved": "2021-11-25T00:00:00.000Z",
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    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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