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
f5
References
Impacted products
Vendor Product Version
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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      "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": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L\", \"baseScore\": 7.7, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"LOW\"}, \"exploitabilityScore\": 2.2, \"impactScore\": 5.5}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:M/Au:N/C:P/I:P/A:P\", \"baseScore\": 6.8, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"MEDIUM\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"PARTIAL\", \"integrityImpact\": \"PARTIAL\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 8.6, \"impactScore\": 6.4, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
      "published": "2021-06-01T13:15:07.853",
      "references": "[{\"url\": \"http://mailman.nginx.org/pipermail/nginx-announce/2021/000300.html\", \"source\": \"f5sirt@f5.com\", \"tags\": [\"Mailing List\", \"Patch\", \"Vendor Advisory\"]}, {\"url\": \"http://packetstormsecurity.com/files/167720/Nginx-1.20.0-Denial-Of-Service.html\", \"source\": \"f5sirt@f5.com\", \"tags\": [\"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"https://lists.apache.org/thread.html/r37e6b2165f7c910d8e15fd54f4697857619ad2625f56583802004009%40%3Cnotifications.apisix.apache.org%3E\", \"source\": \"f5sirt@f5.com\"}, {\"url\": \"https://lists.apache.org/thread.html/r4d4966221ca399ce948ef34884652265729d7d9ef8179c78d7f17e7f%40%3Cnotifications.apisix.apache.org%3E\", \"source\": \"f5sirt@f5.com\"}, {\"url\": \"https://lists.apache.org/thread.html/r6fc5c57b38e93e36213e9a18c8a4e5dbd5ced1c7e57f08a1735975ba%40%3Cnotifications.apisix.apache.org%3E\", \"source\": \"f5sirt@f5.com\"}, {\"url\": \"https://lists.apache.org/thread.html/rf232eecd47fdc44520192810560303073cefd684b321f85e311bad31%40%3Cnotifications.apisix.apache.org%3E\", \"source\": \"f5sirt@f5.com\"}, {\"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\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210708-0006/\", \"source\": \"f5sirt@f5.com\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://support.f5.com/csp/article/K12331123%2C\", \"source\": \"f5sirt@f5.com\"}, {\"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\", \"source\": \"f5sirt@f5.com\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"http://mailman.nginx.org/pipermail/nginx-announce/2021/000300.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Mailing List\", \"Patch\", \"Vendor Advisory\"]}, {\"url\": \"http://packetstormsecurity.com/files/167720/Nginx-1.20.0-Denial-Of-Service.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\", \"VDB Entry\"]}, {\"url\": \"https://lists.apache.org/thread.html/r37e6b2165f7c910d8e15fd54f4697857619ad2625f56583802004009%40%3Cnotifications.apisix.apache.org%3E\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://lists.apache.org/thread.html/r4d4966221ca399ce948ef34884652265729d7d9ef8179c78d7f17e7f%40%3Cnotifications.apisix.apache.org%3E\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://lists.apache.org/thread.html/r6fc5c57b38e93e36213e9a18c8a4e5dbd5ced1c7e57f08a1735975ba%40%3Cnotifications.apisix.apache.org%3E\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://lists.apache.org/thread.html/rf232eecd47fdc44520192810560303073cefd684b321f85e311bad31%40%3Cnotifications.apisix.apache.org%3E\", \"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/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNKOP2JR5L7KCIZTJRZDCUPJTUONMC5I/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20210708-0006/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://support.f5.com/csp/article/K12331123%2C\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"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\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}]",
      "sourceIdentifier": "f5sirt@f5.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"f5sirt@f5.com\", \"type\": \"Secondary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-193\"}]}, {\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-193\"}]}]"
    },
    "microsoft_vex": {
      "current_release_date": "2021-06-11T00:00:00.000Z",
      "cve": "CVE-2021-23017",
      "id": "msrc_CVE-2021-23017",
      "initial_release_date": "2021-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "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.",
      "url": "https://msrc.microsoft.com/csaf/vex/2021/msrc_cve-2021-23017.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-23017\",\"sourceIdentifier\":\"f5sirt@f5.com\",\"published\":\"2021-06-01T13:15:07.853\",\"lastModified\":\"2024-11-21T05:51:09.480\",\"vulnStatus\":\"Modified\",\"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\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L\",\"baseScore\":7.7,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":2.2,\"impactScore\":5.5}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:P/I:P/A:P\",\"baseScore\":6.8,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":8.6,\"impactScore\":6.4,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"f5sirt@f5.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-193\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-193\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"0.6.18\",\"versionEndExcluding\":\"1.20.1\",\"matchCriteriaId\":\"236E1381-BE09-4C0B-9319-E803B7163ECC\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openresty:openresty:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"1.19.3.2\",\"matchCriteriaId\":\"BD31F1B9-1CDB-4547-A19D-6A416FC45510\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E460AA51-FCDA-46B9-AE97-E6676AA5E194\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A930E247-0B43-43CB-98FF-6CE7B8189835\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E7CF3019-975D-40BB-A8A4-894E62BD3797\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:blockchain_platform:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"21.1.2\",\"matchCriteriaId\":\"D0DBC938-A782-433F-8BF1-CA250C332AA7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:communications_control_plane_monitor:3.4:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"21B1EEE2-CC09-45D0-9424-C3DB0EF0DC67\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:communications_control_plane_monitor:4.2:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"30446598-7680-4687-8E41-97E829F24998\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:communications_control_plane_monitor:4.3:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"F280A5FF-93B8-46BB-9A0C-46283CF494AE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:communications_control_plane_monitor:4.4:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"8591B5FB-D04C-477E-B974-60AA047815B2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:communications_fraud_monitor:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.4\",\"versionEndIncluding\":\"4.4\",\"matchCriteriaId\":\"351ECB54-99BC-49E4-8A27-D62380ACFB50\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:communications_operations_monitor:3.4:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"D52F557F-D0A0-43D3-85F1-F10B6EBFAEDF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:communications_operations_monitor:4.2:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"F545DFC9-F331-4E1D-BACB-3D26873E5858\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:communications_operations_monitor:4.3:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"CBE1A019-7BB6-4226-8AC4-9D6927ADAEFA\"},{\"vulnerable\":true,\"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:*:*:*:*:*:*:*\",\"matchCriteri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    "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"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-19T18:16:44Z",
      "cve": "CVE-2021-23017",
      "id": "CVE-2021-23017",
      "initial_release_date": "2023-02-15T03:45:43Z",
      "product_status:recommended": "103",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-23017",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-23017.json",
      "version": "16"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.