{"id":"CVE-2023-44487","published":"2023-10-10T14:15:10Z","modified":"2026-08-11T19:37:30Z","title":"HTTP/2 Rapid Reset Attack Vulnerability","vendor":"IETF","product":"HTTP/2","tier":"core","eol":null,"description":{"text":"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.","provenance":"source","from":"NVD"},"summary":{"text":"The HTTP/2 protocol, as specified by the IETF, contains a flaw in its request cancellation handling that lets clients reset streams in rapid succession, causing uncontrolled resource consumption on the server. An attacker with network access to an HTTP/2 endpoint can exploit this without authentication or user interaction to exhaust server resources and cause denial of service.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:10:52Z"},"cvss":{"score":7.5,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.99999,"percentile":0.99998,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2023-10-10","dueDate":"2023-10-31","ransomware":false,"requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"This vulnerability affects a common open-source component, third-party library, or protocol used by different products. For more information, please see: HTTP/2 Rapid Reset Vulnerability, CVE-2023-44487 | CISA: https://www.cisa.gov/news-events/alerts/2023/10/10/http2-rapid-reset-vulnerability-cve-2023-44487; https://blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack/;  https://nvd.nist.gov/vuln/detail/CVE-2023-44487","provenance":"source"},"vulncheckKev":{"dateAdded":"2023-10-10","exploitedFirstSeen":"2023-10-10","ransomware":false,"evidence":[{"url":"https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2023-Oct","date":"2023-10-10"},{"url":"https://blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack","date":"2023-10-10"},{"url":"https://cloud.google.com/blog/products/identity-security/how-it-works-the-novel-http2-rapid-reset-ddos-attack","date":"2023-10-10"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2023-10-10"},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-44487","date":"2023-10-10"},{"url":"https://www.akamai.com/blog/security/akamai-protects-customers-http2-rapid-reset-ddos-attacks","date":"2023-10-16"},{"url":"https://blog.cloudflare.com/ddos-threat-report-2023-q3/","date":"2023-10-26"},{"url":"https://filestore.fortinet.com/fortiguard/outbreak_alert/Outbreak_Alerts-Annual_Report_2023.pdf","date":"2024-02-20"},{"url":"https://go.recordedfuture.com/hubfs/reports/ta-2024-0321.pdf","date":"2024-03-21"},{"url":"https://www.fortinet.com/content/dam/fortinet/assets/threat-reports/threat-landscape-report-2h-2023.pdf","date":"2024-05-06"}],"evidenceTotal":23,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 30, 2026","url":"https://otx.alienvault.com/pulse/6ae35d889ea92b4ce19c2680","created":"2026-10-29"},{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"}],"provenance":"machine"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"references":[{"url":"http://www.openwall.com/lists/oss-security/2023/10/10/6","tags":["Mailing List","Third Party Advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2023/10/10/7","tags":["Mailing List","Third Party Advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2023/10/13/4","tags":["Mailing List","Third Party Advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2023/10/13/9","tags":["Mailing List","Third Party 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Attackers initiate this vulnerability by sending a crafted sequence of HTTP requests using HEADERS followed by RST_STREAM frames. This allows them to generate substantial traffic on targeted servers, significantly increasing CPU usage and leading to resource exhaustion without authentication.","confidence":"medium","confidenceNote":"CTID KEV capability group \"other\" is generic"},{"id":"T1499","name":"Endpoint Denial of Service","tactics":["impact"],"provenance":"source","basis":"ctid-kev","bases":["ctid-kev"],"basisDetail":"CTID Mappings Explorer KEV 07/28/2025 (ATT&CK 16.1); capability: Other","mappingType":"primary_impact","evidence":[],"comment":"This vulnerability is exploited through a 'Rapid Reset' flaw in HTTP/2 endpoints. Attackers initiate this vulnerability by sending a crafted sequence of HTTP requests using HEADERS followed by RST_STREAM frames. 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