{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-12T06:11:03.042","vulnerabilities":[{"cve":{"id":"CVE-2021-31618","sourceIdentifier":"security@apache.org","published":"2021-06-15T09:15:07.960","lastModified":"2024-11-21T06:06:02.403","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released."},{"lang":"es","value":"El administrador de protocolos del servidor HTTP Apache para el protocolo HTTP/2 comprueba las encabezados de las peticiones recibidas frente a las limitaciones de tamaño configuradas para el servidor y usadas también para el protocolo HTTP/1. En caso de violación de estas restricciones, se envía una respuesta HTTP al cliente con un código de estado indicando por qué se ha rechazado la petición. Esta respuesta de rechazo no se inicializaba completamente en el manejador del protocolo HTTP/2 si la cabecera infractora era la primera que se recibía o aparecía en un pie de página. Esto conllevaba una desviación del puntero NULL en la memoria inicializada, bloqueando de forma fiable el proceso hijo. Dado que desencadenar una petición HTTP/2 de este tipo es fácil de diseñar y enviar, esto puede ser explotado para hacer una DoS al servidor. Este problema afectaba únicamente a mod_http2 versión 1.15.17 y a la versión 2.4.47 del servidor HTTP de Apache. Apache HTTP Server versión 2.4.47 nunca fue liberado"}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P","baseScore":5.0,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL"},"baseSeverity":"MEDIUM","exploitabilityScore":10.0,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"weaknesses":[{"source":"security@apache.org","type":"Secondary","description":[{"lang":"en","value":"CWE-476"}]},{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-476"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:apache:http_server:1.15.17:*:*:*:*:*:*:*","matchCriteriaId":"C0F7A719-7301-47ED-9AC2-5878FA93EC92"},{"vulnerable":true,"criteria":"cpe:2.3:a:apache:http_server:2.4.47:*:*:*:*:*:*:*","matchCriteriaId":"7B335598-BC0C-4993-944B-23798F0CF818"}]}]},{"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:o:debian:debian_linux:9.0:*:*:*:*:*:*:*","matchCriteriaId":"DEECE5FC-CACF-4496-A3E7-164736409252"},{"vulnerable":true,"criteria":"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","matchCriteriaId":"07B237A9-69A3-4A9C-9DA0-4E06BD37AE73"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0.0:*:*:*:*:*:*:*","matchCriteriaId":"B095CC03-7077-4A58-AB25-CC5380CDCE5A"},{"vulnerable":true,"criteria":"cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*","matchCriteriaId":"82EA4BA7-C38B-4AF3-8914-9E3D089EBDD4"},{"vulnerable":true,"criteria":"cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*","matchCriteriaId":"B9C9BC66-FA5F-4774-9BDA-7AB88E2839C4"},{"vulnerable":true,"criteria":"cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*","matchCriteriaId":"7F69B9A5-F21B-4904-9F27-95C0F7A628E3"},{"vulnerable":true,"criteria":"cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*","matchCriteriaId":"D3E503FB-6279-4D4A-91D8-E237ECF9D2B0"}]}]}],"references":[{"url":"http://httpd.apache.org/security/vulnerabilities_24.html","source":"security@apache.org","tags":["Release 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