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CVE-2021-23017 (GCVE-0-2021-23017)

Vulnerability from cvelistv5 – Published: 2021-06-01 12:28 – Updated: 2024-08-03 18:58
VLAI
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.
Severity
7.7 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
n/a Nginx Web Server, Nginx Plus Affected: 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
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                    "criteria": "cpe:2.3:a:oracle:communications_operations_monitor:4.4:*:*:*:*:*:*:*",
                    "matchCriteriaId": "B98BAEB2-A540-4E8A-A946-C4331B913AFD",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:oracle:communications_session_border_controller:8.4:*:*:*:*:*:*:*",
                    "matchCriteriaId": "9C416FD3-2E2F-4BBC-BD5F-F896825883F4",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:oracle:communications_session_border_controller:9.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "D886339E-EDB2-4879-BD54-1800E4CA9CAE",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:oracle:enterprise_communications_broker:3.3.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "3DCDD73B-57B1-4580-B922-5662E3AC13B6",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:oracle:enterprise_session_border_controller:8.4:*:*:*:*:*:*:*",
                    "matchCriteriaId": "7015A8CB-8FA6-423E-8307-BD903244F517",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:oracle:enterprise_session_border_controller:9.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "F9A4E206-56C7-4578-AC9C-088B0C8D9CFE",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:oracle:enterprise_telephony_fraud_monitor:3.4:*:*:*:*:*:*:*",
                    "matchCriteriaId": "E927A24B-3B79-496B-8CE1-334441403750",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:oracle:enterprise_telephony_fraud_monitor:4.2:*:*:*:*:*:*:*",
                    "matchCriteriaId": "BFB6C2AE-8CC3-423B-B0C8-566B643E2CBF",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:oracle:enterprise_telephony_fraud_monitor:4.3:*:*:*:*:*:*:*",
                    "matchCriteriaId": "DBA3E95E-4AD0-4829-9061-F312C09DCFAF",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:oracle:enterprise_telephony_fraud_monitor:4.4:*:*:*:*:*:*:*",
                    "matchCriteriaId": "24AD7EAA-6178-4B2E-B15D-5FC9E23AA2F6",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:oracle:goldengate:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "D972FB51-4035-42DE-A25E-EE12FF67A28C",
                    "versionEndExcluding": "21.4.0.0.0",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "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": "2024-11-21T05:51:09.480",
        "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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            "url": "https://lists.apache.org/thread.html/rf318aeeb4d7a3a312734780b47de83cefb7e6995da0b2cae5c28675c%40%3Cnotifications.apisix.apache.org%3E"
          },
          {
            "source": "f5sirt@f5.com",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7SFVYHC7OXTEO4SMBWXDVK6E5IMEYMEE/"
          },
          {
            "source": "f5sirt@f5.com",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNKOP2JR5L7KCIZTJRZDCUPJTUONMC5I/"
          },
          {
            "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"
            ],
            "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
          },
          {
            "source": "f5sirt@f5.com",
            "tags": [
              "Patch",
              "Third Party Advisory"
            ],
            "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
          },
          {
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            "tags": [
              "Mailing List",
              "Patch",
              "Vendor Advisory"
            ],
            "url": "http://mailman.nginx.org/pipermail/nginx-announce/2021/000300.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory",
              "VDB Entry"
            ],
            "url": "http://packetstormsecurity.com/files/167720/Nginx-1.20.0-Denial-Of-Service.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
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          },
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          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.apache.org/thread.html/rf318aeeb4d7a3a312734780b47de83cefb7e6995da0b2cae5c28675c%40%3Cnotifications.apisix.apache.org%3E"
          },
          {
            "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",
            "tags": [
              "Third Party Advisory"
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            "url": "https://security.netapp.com/advisory/ntap-20210708-0006/"
          },
          {
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            "url": "https://support.f5.com/csp/article/K12331123%2C"
          },
          {
            "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"
          },
          {
            "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"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-04T08:47:14+00:00",
      "cve": "CVE-2021-23017",
      "id": "CVE-2021-23017",
      "initial_release_date": "2021-05-25T00:00:00+00:00",
      "product_status:fixed": "403",
      "product_status:known_affected": "10",
      "product_status:known_not_affected": "11",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-23017.json",
      "version": "3"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.