{"id":"CVE-2023-43622","state":"PUBLISHED","title":"Apache HTTP Server: DoS in HTTP/2 with initial windows size 0","description":"An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connection indefinitely in Apache HTTP Server. This could be used to exhaust worker resources in the server, similar to the well known \"slow loris\" attack pattern.\nThis has been fixed in version 2.4.58, so that such connection are terminated properly after the configured connection timeout.\n\nThis issue affects Apache HTTP Server: from 2.4.55 through 2.4.57.\n\nUsers are recommended to upgrade to version 2.4.58, which fixes the issue.","publishedAt":"2023-10-23T06:50:51.555Z","updatedAt":"2025-02-13T17:13:24.282Z","severity":null,"assigner":"apache","products":["Apache Software Foundation Apache HTTP Server"],"affected":[{"vendor":"Apache Software Foundation","product":"Apache HTTP Server","defaultStatus":"unaffected","versions":[{"version":"2.4.55","status":"affected","lessThanOrEqual":"2.4.57","versionType":"semver"}]}],"references":["https://httpd.apache.org/security/vulnerabilities_24.html","https://security.netapp.com/advisory/ntap-20231027-0011/"],"weaknesses":["CWE-400"],"ingestedAt":"2026-10-29T20:06:17.512Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/43xxx/CVE-2023-43622.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-43622","state":"PUBLISHED","datePublished":"2023-10-23T06:50:51.555Z","dateUpdated":"2025-02-13T17:13:24.282Z","assignerShortName":"apache","assignerOrgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateReserved":"2023-09-20T07:45:21.299Z"},"containers":{"cna":{"title":"Apache HTTP Server: DoS in HTTP/2 with initial windows size 0","descriptions":[{"lang":"en","value":"An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connection indefinitely in Apache HTTP Server. This could be used to exhaust worker resources in the server, similar to the well known \"slow loris\" attack pattern.\nThis has been fixed in version 2.4.58, so that such connection are terminated properly after the configured connection timeout.\n\nThis issue affects Apache HTTP Server: from 2.4.55 through 2.4.57.\n\nUsers are recommended to upgrade to version 2.4.58, which fixes the issue."}],"affected":[{"vendor":"Apache Software Foundation","product":"Apache HTTP Server","defaultStatus":"unaffected","versions":[{"version":"2.4.55","status":"affected","lessThanOrEqual":"2.4.57","versionType":"semver"}]}],"references":[{"url":"https://httpd.apache.org/security/vulnerabilities_24.html","tags":["vendor-advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20231027-0011/"}],"metrics":[{"other":{"content":{"text":"low"},"type":"Textual description of severity"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","description":"CWE-400 Uncontrolled Resource Consumption","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"apache","orgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateUpdated":"2023-10-27T14:06:25.665Z"},"credits":[{"lang":"en","type":"finder","value":"Prof. Sven Dietrich (City University of New York)"},{"lang":"en","type":"finder","value":"Isa Jafarov (City University of New York)"},{"lang":"en","type":"finder","value":"Prof. Heejo Lee (Korea University)"},{"lang":"en","type":"finder","value":"Choongin Lee (Korea University)"}],"source":{"discovery":"EXTERNAL"},"timeline":[{"lang":"en","time":"2023-09-15T09:51:00.000Z","value":"reported"}],"x_generator":{"engine":"Vulnogram 0.1.0-dev"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://httpd.apache.org/security/vulnerabilities_24.html","tags":["vendor-advisory","x_transferred"]},{"url":"https://security.netapp.com/advisory/ntap-20231027-0011/","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-02T19:44:43.773Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-09-11T16:02:28.689513Z","id":"CVE-2023-43622","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-09-17T14:19:24.281Z"}}]}}}