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.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| org.apache.tomcat.embed:tomcat-embed-core(Maven) | 9.0.0 | 9.0.16 | N/A |
| org.apache.tomcat.embed:tomcat-embed-core(Maven) | 8.0.0 | 8.5.38 | N/A |
CVSS Metrics
