Vulnerability-Lookup

FKIE_CVE-2021-39275

Vulnerability from fkie_nvd - Published: 2021-09-16 15:15 - Updated: 2026-06-17 04:03

Severity

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

Summary

ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules pass untrusted data to these functions, but third-party / external modules may. This issue affects Apache HTTP Server 2.4.48 and earlier.

References

URL	Tags
security@apache.org	https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf	Third Party Advisory
security@apache.org	https://httpd.apache.org/security/vulnerabilities_24.html	Release Notes, Vendor Advisory
security@apache.org	https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E	Patch
security@apache.org	https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E	Patch
security@apache.org	https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E	Patch
security@apache.org	https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E	Patch
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/	Third Party Advisory
security@apache.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/	Third Party Advisory
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
af854a3a-2127-422b-91ae-364da2661108	https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://httpd.apache.org/security/vulnerabilities_24.html	Release Notes, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E	Patch
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/	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/	Third Party Advisory
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

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	-
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	zfs_storage_appliance_kit	8.8
siemens	sinec_nms	*
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",
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              "versionType": "custom"
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      "source": "security@apache.org"
    }
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules pass untrusted data to these functions, but third-party / external modules may. This issue affects Apache HTTP Server 2.4.48 and earlier."
    },
    {
      "lang": "es",
      "value": "la funci\u00f3n ap_escape_quotes() puede escribir m\u00e1s all\u00e1 del final de un buffer cuando se le da una entrada maliciosa. Ning\u00fan m\u00f3dulo incluido pasa datos no confiables a estas funciones, pero los m\u00f3dulos externos o de terceros pueden hacerlo. Este problema afecta a Apache HTTP Server versiones 2.4.48 y anteriores"
    }
  ],
  "id": "CVE-2021-39275",
  "lastModified": "2026-06-17T04:03:27.313",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 7.5,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-09-16T15:15:07.580",
  "references": [
    {
      "source": "security@apache.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf"
    },
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    },
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    },
    {
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      "tags": [
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      ],
      "url": "https://security.gentoo.org/glsa/202208-20"
    },
    {
      "source": "security@apache.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.netapp.com/advisory/ntap-20211008-0004/"
    },
    {
      "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": [
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      ],
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    },
    {
      "source": "security@apache.org",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
    },
    {
      "source": "security@apache.org",
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        "Third Party Advisory"
      ],
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    },
    {
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.gentoo.org/glsa/202208-20"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.netapp.com/advisory/ntap-20211008-0004/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.debian.org/security/2021/dsa-4982"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
    }
  ],
  "sourceIdentifier": "security@apache.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-39275 (GCVE-0-2021-39275)

Vulnerability from cvelistv5 – Published: 2021-09-16 14:40 – Updated: 2024-08-04 02:06

Title

ap_escape_quotes buffer overflow

Summary

Severity

No CVSS data available.

CWE

Buffer Overflow

Assigner

apache CNA under the mitre root

CNA scorecard B 76/100 over 939 records in the last 180 days details

References

15 references

URL	Tags
https://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://security.netapp.com/advisory/ntap-2021100…	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

ClusterFuzz

Show details on NVD website

JSON

To clipboard

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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.

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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FKIE_CVE-2021-39275

CVE-2021-39275 (GCVE-0-2021-39275)

Tags

Sightings

Nomenclature

Related by attack behaviour