{"cve":"CVE-2019-0199","nvd":{"published":"2019-04-10T15:29:00.390","modified":"2026-06-17T02:07:56.857","status":"Modified","description":"The HTTP/2 implementation in Apache Tomcat 9.0.0.M1 to 9.0.14 and 8.5.0 to 8.5.37 accepted streams with excessive numbers of SETTINGS frames and also permitted clients to keep streams open without reading/writing request/response data. By keeping streams open for requests that utilised the Servlet API's blocking I/O, clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400"],"references":["http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00090.html","http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00013.html","http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00054.html","http://www.securityfocus.com/bid/107674","https://access.redhat.com/errata/RHSA-2019:3929"],"products":["apache:tomcat"],"source":"nvd","synced_at":"2026-10-19T20:55:22.313337056+00:00"},"epss":{"cve":"CVE-2019-0199","score":0.72855,"percentile":0.9945,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-qcxh-w3j9-58qr","url":"https://osv.dev/vulnerability/GHSA-qcxh-w3j9-58qr","summary":"Apache Tomcat Denial of Service vulnerability","modified":"2026-05-20T19:00:16.292591175Z","packages":[{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","ranges":[">=9.0.0 <9.0.16"],"fixed":["9.0.16"]},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","purl":"pkg:maven/org.apache.tomcat.embed/tomcat-embed-core","ranges":[">=8.0.0 <8.5.38"],"fixed":["8.5.38"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=9.0.0 <9.0.16"],"fixed":["9.0.16"]},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","purl":"pkg:maven/org.apache.tomcat/tomcat-coyote","ranges":[">=8.0.0 <8.5.38"],"fixed":["8.5.38"]}]}],"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."]}