A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Apache Tomcat | — | Upgrade Apache Tomcat to 8.5.56Upgrade Apache Tomcat to 10.0.0Upgrade Apache Tomcat to 9.0.36Upgrade Apache Tomcat to the latest available version | Jun 26, 2020 | Jun 26, 2020 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Jun 26, 2020 |
| Debian | — | Upgrade tomcat9 | Jul 14, 2020 | Jun 26, 2020 |
| Freebsd | — | Upgrade tomcat85Upgrade tomcat-develUpgrade tomcat7Upgrade tomcat9 | Jul 24, 2020 | Jul 23, 2020 |
| Huawei Euleros 2_0_sp8 | — | Upgrade tomcat-servlet-4.0-apiUpgrade tomcat-jsp-2.3-apiUpgrade tomcat-el-3.0-apiUpgrade tomcatUpgrade tomcat-admin-webappsUpgrade tomcat-lib | Jul 31, 2020 | Jun 26, 2020 |
| Oracle Solaris | — | Upgrade web/java-servlet/tomcat-8/tomcat-admin to version 8.5.57-11.4.25.0.1.75.1 on Solaris 11.4Upgrade web/java-servlet/tomcat-8/tomcat-examples to version 8.5.57-11.4.25.0.1.75.1 on Solaris 11.4Upgrade web/java-servlet/tomcat-8 to version 8.5.57-11.4.25.0.1.75.1 on Solaris 11.4 | Jan 19, 2021 | Jun 26, 2020 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 26, 2020 |
| Suse | — | Upgrade tomcat-jsp-2_3-apiUpgrade tomcat-javadocUpgrade tomcat-embedUpgrade tomcat-jsvcUpgrade tomcatUpgrade tomcat-docs-webappUpgrade tomcat-webappsUpgrade tomcat-admin-webappsUpgrade tomcat-libUpgrade tomcat-el-3_0-apiUpgrade tomcat-servlet-4_0-api | Jul 4, 2020 | Jun 26, 2020 |
| Ubuntu | — | Upgrade tomcat9Upgrade tomcat9-commonUpgrade libtomcat9-embed-javaUpgrade libtomcat9-java | Oct 22, 2020 | Jun 26, 2020 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Jun 26, 2020 |
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