{"cve":"CVE-2023-44487","nvd":{"published":"2023-10-10T14:15:10.883","modified":"2026-08-11T19:37:30.880","status":"Analyzed","description":"The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.","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-400"],"references":["http://www.openwall.com/lists/oss-security/2023/10/10/6","http://www.openwall.com/lists/oss-security/2023/10/10/7","http://www.openwall.com/lists/oss-security/2023/10/13/4","http://www.openwall.com/lists/oss-security/2023/10/13/9","http://www.openwall.com/lists/oss-security/2023/10/18/4"],"products":["akka:http_server","amazon:opensearch_data_prepper","apache:apisix","apache:solr","apache:tomcat","apache:traffic_server","apple:swiftnio_http\\/2","caddyserver:caddy","cisco:business_process_automation","cisco:connected_mobile_experiences","cisco:crosswork_data_gateway","cisco:crosswork_situation_manager","cisco:crosswork_zero_touch_provisioning","cisco:data_center_network_manager","cisco:enterprise_chat_and_email","cisco:expressway","cisco:fog_director","cisco:ios_xe","cisco:ios_xr","cisco:iot_field_network_director","cisco:nx-os","cisco:prime_access_registrar","cisco:prime_cable_provisioning","cisco:prime_infrastructure","cisco:prime_network_registrar","cisco:secure_dynamic_attributes_connector","cisco:secure_firewall_threat_defense","cisco:secure_malware_analytics","cisco:secure_web_appliance_firmware","cisco:telepresence_video_communication_server","cisco:ultra_cloud_core_-_policy_control_function","cisco:ultra_cloud_core_-_serving_gateway_function","cisco:ultra_cloud_core_-_session_management_function","cisco:unified_attendant_console_advanced","cisco:unified_contact_center_domain_manager","cisco:unified_contact_center_enterprise","cisco:unified_contact_center_enterprise_-_live_data_server","cisco:unified_contact_center_management_portal","debian:debian_linux","dena:h2o","eclipse:jetty","envoyproxy:envoy","f5:big-ip_access_policy_manager","f5:big-ip_advanced_firewall_manager","f5:big-ip_advanced_web_application_firewall","f5:big-ip_analytics","f5:big-ip_application_acceleration_manager","f5:big-ip_application_security_manager","f5:big-ip_application_visibility_and_reporting","f5:big-ip_carrier-grade_nat"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2023-44487","score":0.99999,"percentile":0.99998,"date":"2026-10-31"},"kev":{"cve":"CVE-2023-44487","date_added":"2023-10-10","due_date":"2023-10-31","vendor":"IETF","product":"HTTP/2","known_ransomware":false},"osv":[{"id":"GHSA-qppj-fm5r-hxr3","url":"https://osv.dev/vulnerability/GHSA-qppj-fm5r-hxr3","summary":"HTTP/2 Stream Cancellation Attack","modified":"2026-09-10T03:50:04.757558216Z","packages":[{"ecosystem":"SwiftURL","name":"github.com/apple/swift-nio-http2","purl":"pkg:swift/github.com/apple/swift-nio-http2","ranges":["<1.28.0"],"fixed":["1.28.0"]},{"ecosystem":"Go","name":"golang.org/x/net","purl":"pkg:golang/golang.org/x/net","ranges":["<0.17.0"],"fixed":["0.17.0"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=11.0.0-M1 <11.0.0-M12"],"fixed":["11.0.0-M12"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=10.0.0 <10.1.14"],"fixed":["10.1.14"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=9.0.0 <9.0.81"],"fixed":["9.0.81"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=8.5.0 <8.5.94"],"fixed":["8.5.94"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","ranges":[">=11.0.0-M1 <11.0.0-M12"],"fixed":["11.0.0-M12"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","ranges":[">=10.0.0 <10.1.14"],"fixed":["10.1.14"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","ranges":[">=9.0.0 <9.0.81"],"fixed":["9.0.81"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","ranges":[">=8.5.0 <8.5.94"],"fixed":["8.5.94"]},{"ecosystem":"Maven","name":"org.eclipse.jetty.http2:http2-common","purl":"pkg:maven/org.eclipse.jetty.http2/http2-common","ranges":[">=9.3.0 <9.4.53"],"fixed":["9.4.53"]},{"ecosystem":"Maven","name":"org.eclipse.jetty.http2:http2-common","purl":"pkg:maven/org.eclipse.jetty.http2/http2-common","ranges":[">=10.0.0 <10.0.17"],"fixed":["10.0.17"]},{"ecosystem":"Maven","name":"org.eclipse.jetty.http2:http2-common","purl":"pkg:maven/org.eclipse.jetty.http2/http2-common","ranges":[">=11.0.0 <11.0.17"],"fixed":["11.0.17"]},{"ecosystem":"Maven","name":"org.eclipse.jetty.http2:http2-server","purl":"pkg:maven/org.eclipse.jetty.http2/http2-server","ranges":[">=9.3.0 <9.4.53"],"fixed":["9.4.53"]},{"ecosystem":"Maven","name":"org.eclipse.jetty.http2:http2-server","purl":"pkg:maven/org.eclipse.jetty.http2/http2-server","ranges":[">=10.0.0 <10.0.17"],"fixed":["10.0.17"]},{"ecosystem":"Maven","name":"org.eclipse.jetty.http2:http2-server","purl":"pkg:maven/org.eclipse.jetty.http2/http2-server","ranges":[">=11.0.0 <11.0.17"],"fixed":["11.0.17"]},{"ecosystem":"Maven","name":"org.eclipse.jetty.http2:jetty-http2-common","purl":"pkg:maven/org.eclipse.jetty.http2/jetty-http2-common","ranges":[">=12.0.0 <12.0.2"],"fixed":["12.0.2"]},{"ecosystem":"Maven","name":"org.eclipse.jetty.http2:jetty-http2-server","purl":"pkg:maven/org.eclipse.jetty.http2/jetty-http2-server","ranges":[">=12.0.0 <12.0.2"],"fixed":["12.0.2"]},{"ecosystem":"Maven","name":"com.typesafe.akka:akka-http-core","purl":"pkg:maven/com.typesafe.akka/akka-http-core","ranges":["<10.5.3"],"fixed":["10.5.3"]},{"ecosystem":"Maven","name":"com.typesafe.akka:akka-http-core_2.13","purl":"pkg:maven/com.typesafe.akka/akka-http-core_2.13","ranges":["<10.5.3"],"fixed":["10.5.3"]},{"ecosystem":"Maven","name":"com.typesafe.akka:akka-http-core_2.12","purl":"pkg:maven/com.typesafe.akka/akka-http-core_2.12","ranges":["<10.5.3"],"fixed":["10.5.3"]},{"ecosystem":"Maven","name":"com.typesafe.akka:akka-http-core_2.11","purl":"pkg:maven/com.typesafe.akka/akka-http-core_2.11","ranges":["<=10.1.15"],"fixed":[]}]}],"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."]}