FKIE_CVE-2021-23017

Vulnerability from fkie_nvd - Published: 2021-06-01 13:15 - Updated: 2026-06-17 03:38
Severity
7.7 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
Summary
A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact.
References
f5sirt@f5.comhttp://mailman.nginx.org/pipermail/nginx-announce/2021/000300.htmlMailing List, Patch, Vendor Advisory
f5sirt@f5.comhttp://packetstormsecurity.com/files/167720/Nginx-1.20.0-Denial-Of-Service.htmlThird Party Advisory, VDB Entry
f5sirt@f5.comhttps://lists.apache.org/thread.html/r37e6b2165f7c910d8e15fd54f4697857619ad2625f56583802004009%40%3Cnotifications.apisix.apache.org%3E
f5sirt@f5.comhttps://lists.apache.org/thread.html/r4d4966221ca399ce948ef34884652265729d7d9ef8179c78d7f17e7f%40%3Cnotifications.apisix.apache.org%3E
f5sirt@f5.comhttps://lists.apache.org/thread.html/r6fc5c57b38e93e36213e9a18c8a4e5dbd5ced1c7e57f08a1735975ba%40%3Cnotifications.apisix.apache.org%3E
f5sirt@f5.comhttps://lists.apache.org/thread.html/rf232eecd47fdc44520192810560303073cefd684b321f85e311bad31%40%3Cnotifications.apisix.apache.org%3E
f5sirt@f5.comhttps://lists.apache.org/thread.html/rf318aeeb4d7a3a312734780b47de83cefb7e6995da0b2cae5c28675c%40%3Cnotifications.apisix.apache.org%3E
f5sirt@f5.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7SFVYHC7OXTEO4SMBWXDVK6E5IMEYMEE/
f5sirt@f5.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNKOP2JR5L7KCIZTJRZDCUPJTUONMC5I/
f5sirt@f5.comhttps://security.netapp.com/advisory/ntap-20210708-0006/Third Party Advisory
f5sirt@f5.comhttps://support.f5.com/csp/article/K12331123%2C
f5sirt@f5.comhttps://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
f5sirt@f5.comhttps://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
f5sirt@f5.comhttps://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://mailman.nginx.org/pipermail/nginx-announce/2021/000300.htmlMailing List, Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/167720/Nginx-1.20.0-Denial-Of-Service.htmlThird Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/r37e6b2165f7c910d8e15fd54f4697857619ad2625f56583802004009%40%3Cnotifications.apisix.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/r4d4966221ca399ce948ef34884652265729d7d9ef8179c78d7f17e7f%40%3Cnotifications.apisix.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/r6fc5c57b38e93e36213e9a18c8a4e5dbd5ced1c7e57f08a1735975ba%40%3Cnotifications.apisix.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/rf232eecd47fdc44520192810560303073cefd684b321f85e311bad31%40%3Cnotifications.apisix.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/rf318aeeb4d7a3a312734780b47de83cefb7e6995da0b2cae5c28675c%40%3Cnotifications.apisix.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7SFVYHC7OXTEO4SMBWXDVK6E5IMEYMEE/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNKOP2JR5L7KCIZTJRZDCUPJTUONMC5I/
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20210708-0006/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://support.f5.com/csp/article/K12331123%2C
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
Impacted products
Vendor Product Version
f5 nginx *
openresty openresty *
fedoraproject fedora 33
fedoraproject fedora 34
netapp ontap_select_deploy_administration_utility -
oracle blockchain_platform *
oracle communications_control_plane_monitor 3.4
oracle communications_control_plane_monitor 4.2
oracle communications_control_plane_monitor 4.3
oracle communications_control_plane_monitor 4.4
oracle communications_fraud_monitor *
oracle communications_operations_monitor 3.4
oracle communications_operations_monitor 4.2
oracle communications_operations_monitor 4.3
oracle communications_operations_monitor 4.4
oracle communications_session_border_controller 8.4
oracle communications_session_border_controller 9.0
oracle enterprise_communications_broker 3.3.0
oracle enterprise_session_border_controller 8.4
oracle enterprise_session_border_controller 9.0
oracle enterprise_telephony_fraud_monitor 3.4
oracle enterprise_telephony_fraud_monitor 4.2
oracle enterprise_telephony_fraud_monitor 4.3
oracle enterprise_telephony_fraud_monitor 4.4
oracle goldengate *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Nginx Web Server, Nginx Plus",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "Nginx Web Server versions 0.6.18 thru 1.20.0 before 1.20.1, Nginx plus versions R13 thru R23 before R23 P1. Nginx plus version R24 before R24 P1"
            }
          ]
        }
      ],
      "source": "f5sirt@f5.com"
    }
  ],
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact."
    },
    {
      "lang": "es",
      "value": "Se identific\u00f3 un problema de seguridad en el solucionador de nginx, que podr\u00eda permitir a un atacante que pueda falsificar paquetes UDP desde el servidor DNS para causar una sobrescritura de memoria de 1 byte, lo que causar\u00eda un bloqueo del proceso de trabajo u otro impacto potencial"
    }
  ],
  "id": "CVE-2021-23017",
  "lastModified": "2026-06-17T03:38:13.130",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 6.8,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 7.7,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.5,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-06-01T13:15:07.853",
  "references": [
    {
      "source": "f5sirt@f5.com",
      "tags": [
        "Mailing List",
        "Patch",
        "Vendor Advisory"
      ],
      "url": "http://mailman.nginx.org/pipermail/nginx-announce/2021/000300.html"
    },
    {
      "source": "f5sirt@f5.com",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "http://packetstormsecurity.com/files/167720/Nginx-1.20.0-Denial-Of-Service.html"
    },
    {
      "source": "f5sirt@f5.com",
      "url": "https://lists.apache.org/thread.html/r37e6b2165f7c910d8e15fd54f4697857619ad2625f56583802004009%40%3Cnotifications.apisix.apache.org%3E"
    },
    {
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    },
    {
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    },
    {
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    {
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    {
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    },
    {
      "source": "f5sirt@f5.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.netapp.com/advisory/ntap-20210708-0006/"
    },
    {
      "source": "f5sirt@f5.com",
      "url": "https://support.f5.com/csp/article/K12331123%2C"
    },
    {
      "source": "f5sirt@f5.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
    },
    {
      "source": "f5sirt@f5.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
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      "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
    },
    {
      "source": "f5sirt@f5.com",
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      "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
    },
    {
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      "tags": [
        "Mailing List",
        "Patch",
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      "url": "http://mailman.nginx.org/pipermail/nginx-announce/2021/000300.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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        "VDB Entry"
      ],
      "url": "http://packetstormsecurity.com/files/167720/Nginx-1.20.0-Denial-Of-Service.html"
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    },
    {
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7SFVYHC7OXTEO4SMBWXDVK6E5IMEYMEE/"
    },
    {
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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    },
    {
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      "url": "https://support.f5.com/csp/article/K12331123%2C"
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      "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"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
    }
  ],
  "sourceIdentifier": "f5sirt@f5.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-193"
        }
      ],
      "source": "f5sirt@f5.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-193"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



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.