{"cve":"CVE-2021-34798","nvd":{"published":"2021-09-16T15:15:07.267","modified":"2026-06-17T03:56:35.580","status":"Modified","description":"Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-476"],"references":["http://httpd.apache.org/security/vulnerabilities_24.html","https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf","https://kc.mcafee.com/corporate/index?page=content&id=SB10379","https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E","https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E"],"products":["apache:http_server","broadcom:brocade_fabric_operating_system_firmware","debian:debian_linux","fedoraproject:fedora","netapp:cloud_backup","netapp:clustered_data_ontap","netapp:storagegrid","oracle:communications_cloud_native_core_network_function_cloud_native_environment","oracle:enterprise_manager_base_platform","oracle:http_server","oracle:instantis_enterprisetrack","oracle:peoplesoft_enterprise_peopletools","oracle:zfs_storage_appliance_kit","siemens:ruggedcom_nms","siemens:sinec_nms","siemens:sinema_remote_connect_server","siemens:sinema_server","tenable:tenable.sc"],"source":"nvd","synced_at":"2026-10-19T21:23:41.316049955+00:00"},"epss":{"cve":"CVE-2021-34798","score":0.64509,"percentile":0.99238,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}