Vulnerability-Lookup

FKIE_CVE-2021-34798

Vulnerability from fkie_nvd - Published: 2021-09-16 15:15 - Updated: 2026-06-17 03:56

Severity

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

Summary

Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.

References

URL	Tags
security@apache.org	http://httpd.apache.org/security/vulnerabilities_24.html	Release Notes, Vendor Advisory
security@apache.org	https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf	Patch, Third Party Advisory
security@apache.org	https://kc.mcafee.com/corporate/index?page=content&id=SB10379	Third Party Advisory
security@apache.org	https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E
security@apache.org	https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E
security@apache.org	https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E
security@apache.org	https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E
security@apache.org	https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html	Mailing List, Third Party Advisory
security@apache.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/
security@apache.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/
security@apache.org	https://security.gentoo.org/glsa/202208-20	Third Party Advisory
security@apache.org	https://security.netapp.com/advisory/ntap-20211008-0004/	Third Party Advisory
security@apache.org	https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ	Third Party Advisory
security@apache.org	https://www.debian.org/security/2021/dsa-4982	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-2021-17	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	http://httpd.apache.org/security/vulnerabilities_24.html	Release Notes, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://kc.mcafee.com/corporate/index?page=content&id=SB10379	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108	https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108	https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108	https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html	Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/
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-20211008-0004/	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.debian.org/security/2021/dsa-4982	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-2021-17	Third Party Advisory

Impacted products

Vendor	Product	Version
apache	http_server	*
fedoraproject	fedora	34
fedoraproject	fedora	35
debian	debian_linux	9.0
debian	debian_linux	10.0
debian	debian_linux	11.0
netapp	cloud_backup	-
netapp	clustered_data_ontap	-
netapp	storagegrid	-
tenable	tenable.sc	*
oracle	communications_cloud_native_core_network_function_cloud_native_environment	1.10.0
oracle	enterprise_manager_base_platform	13.4.0.0
oracle	enterprise_manager_base_platform	13.5.0.0
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
oracle	peoplesoft_enterprise_peopletools	8.58
oracle	zfs_storage_appliance_kit	8.8
broadcom	brocade_fabric_operating_system_firmware	-
siemens	ruggedcom_nms	*
siemens	sinec_nms	*
siemens	sinema_remote_connect_server	*
siemens	sinema_server	14.0

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Apache HTTP Server",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThanOrEqual": "2.4.48",
              "status": "affected",
              "version": "Apache HTTP Server 2.4",
              "versionType": "custom"
            }
          ]
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      ],
      "source": "security@apache.org"
    }
  ],
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              "vulnerable": true
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              "criteria": "cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:*",
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              "vulnerable": true
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      ]
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier."
    },
    {
      "lang": "es",
      "value": "Unas peticiones malformadas pueden causar que el servidor haga desreferencia a un puntero NULL. Este problema afecta a Apache HTTP Server versiones 2.4.48 y anteriores"
    }
  ],
  "id": "CVE-2021-34798",
  "lastModified": "2026-06-17T03:56:35.580",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-09-16T15:15:07.267",
  "references": [
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      "source": "security@apache.org",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
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      "url": "http://httpd.apache.org/security/vulnerabilities_24.html"
    },
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      "url": "https://security.netapp.com/advisory/ntap-20211008-0004/"
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    {
      "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.debian.org/security/2021/dsa-4982"
    },
    {
      "source": "security@apache.org",
      "tags": [
        "Patch",
        "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": [
        "Third Party Advisory"
      ],
      "url": "https://www.tenable.com/security/tns-2021-17"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "url": "http://httpd.apache.org/security/vulnerabilities_24.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10379"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E"
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    },
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CVE-2021-34798 (GCVE-0-2021-34798)

Vulnerability from cvelistv5 – Published: 2021-09-16 14:40 – Updated: 2024-08-04 00:26

Title

NULL pointer dereference in httpd core

Summary

Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.

Severity

No CVSS data available.

CWE

CWE-476 - NULL Pointer Dereference

Assigner

apache mitre root

References

17 references

URL	Tags
http://httpd.apache.org/security/vulnerabilities_…	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.apache.org/thread.html/r82838efc5fa…	mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r82c077663f9…	mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r3925e167d5e…	mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r61fdbfc26ab…	mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.debian.org/debian-lts-announce/2021…	mailing-listx_refsource_MLIST
https://www.debian.org/security/2021/dsa-4982	vendor-advisoryx_refsource_DEBIAN
https://tools.cisco.com/security/center/content/C…	vendor-advisoryx_refsource_CISCO
https://www.oracle.com/security-alerts/cpujan2022.html	x_refsource_MISC
https://www.tenable.com/security/tns-2021-17	x_refsource_CONFIRM
https://security.netapp.com/advisory/ntap-2021100…	x_refsource_CONFIRM
https://kc.mcafee.com/corporate/index?page=conten…	x_refsource_CONFIRM
https://www.oracle.com/security-alerts/cpuapr2022.html	x_refsource_MISC
https://cert-portal.siemens.com/productcert/pdf/s…	x_refsource_CONFIRM
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: Apache HTTP Server 2.4 , ≤ 2.4.48 (custom)

Credits

The issue was discovered by the Apache HTTP security team

Show details on NVD website

JSON

To clipboard

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              "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf"
            },
            {
              "name": "GLSA-202208-20",
              "refsource": "GENTOO",
              "url": "https://security.gentoo.org/glsa/202208-20"
            }
          ]
        },
        "source": {
          "discovery": "UNKNOWN"
        },
        "timeline": [
          {
            "lang": "en",
            "time": "2021-09-16T00:00:00.000Z",
            "value": "2.4.49 released"
          }
        ]
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2021-34798",
    "datePublished": "2021-09-16T14:40:17.000Z",
    "dateReserved": "2021-06-16T00:00:00.000Z",
    "dateUpdated": "2024-08-04T00:26:54.014Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

Detection rules are retrieved from Rulezet.

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.