CVE-2017-5650: Apache Tomcat

High severity, CVSS 7.5. EPSS: 8.3% chance of exploitation in the next 30 days.

In Apache Tomcat 9.0.0.M1 to 9.0.0.M18 and 8.5.0 to 8.5.12, the handling of an HTTP/2 GOAWAY frame for a connection did not close streams associated with that connection that were currently waiting for a WINDOW_UPDATE before allowing the application to write more data. These waiting streams each consumed a thread. A malicious client could therefore construct a series of HTTP/2 requests that would consume all available processing threads.

Affected products

• Apache Tomcat: version 8.5.0 only; version 8.5.1 only; version 8.5.2 only; version 8.5.3 only; version 8.5.4 only; version 8.5.5 only; …

Published 2017-04-17. Last modified 2026-06-17.