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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux | — | Upgrade tomcat8 | May 21, 2019 | Apr 10, 2019 |
| Apache Tomcat | — | Upgrade Apache Tomcat to 8.5.38Upgrade Apache Tomcat to 9.0.16Upgrade Apache Tomcat to the latest available version | Apr 10, 2019 | Apr 10, 2019 |
| Debian | — | Upgrade tomcat9 | Dec 30, 2019 | Apr 10, 2019 |
| Huawei Euleros 2_0_sp8 | — | Upgrade tomcat-libUpgrade tomcat-el-3.0-apiUpgrade tomcat-admin-webappsUpgrade tomcatUpgrade tomcat-jsp-2.3-apiUpgrade tomcat-servlet-4.0-api | Jul 26, 2019 | Apr 10, 2019 |
| Oracle Solaris | — | Upgrade web/java-servlet/tomcat-8 to version 8.5.39-11.4.9.0.1.2.0 on Solaris 11.4Upgrade web/java-servlet/tomcat-8/tomcat-examples to version 8.5.39-11.4.9.0.1.2.0 on Solaris 11.4Upgrade web/java-servlet/tomcat-8/tomcat-admin to version 8.5.51-0.175.3.36.0.20.0 on Solaris 11.3Upgrade web/java-servlet/tomcat-8 to version 8.5.51-0.175.3.36.0.20.0 on Solaris 11.3Upgrade web/java-servlet/tomcat-8/tomcat-examples to version 8.5.51-0.175.3.36.0.20.0 on Solaris 11.3Upgrade web/java-servlet/tomcat-8/tomcat-admin to version 8.5.39-11.4.9.0.1.2.0 on Solaris 11.4 | May 30, 2019 | Apr 10, 2019 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Apr 10, 2019 |
| Suse | — | Upgrade tomcat-admin-webappsUpgrade tomcat-el-3_0-apiUpgrade tomcat-servlet-4_0-apiUpgrade tomcat-embedUpgrade tomcat-libUpgrade tomcat-javadocUpgrade tomcat-docs-webappUpgrade tomcat-jsvcUpgrade tomcat-webappsUpgrade tomcatUpgrade tomcat-jsp-2_3-api | Jul 2, 2019 | Apr 10, 2019 |
| Ubuntu | — | Upgrade tomcat8 | Sep 11, 2019 | Apr 10, 2019 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Apr 10, 2019 |
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