| Package | Affected versions | Patched versions |
|---|---|---|
| org.apache.tomcat.embed:tomcat-embed-core | ≥ 8.0.0, < 8.5.38≥ 9.0.0, < 9.0.16 | 8.5.389.0.16 |
| org.apache.tomcat:tomcat-coyote | ≥ 8.0.0, < 8.5.38≥ 9.0.0, < 9.0.16 | 8.5.389.0.16 |
| tomcat | = 9.0.0≥ 8.5.0, ≤ 8.5.37≥ 9.0.1, ≤ 9.0.14 |
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.
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