CVE-2016-6817: Apache Tomcat

High severity, CVSS 7.5. EPSS: 7.2% chance of exploitation in the next 30 days.

The HTTP/2 header parser in Apache Tomcat 9.0.0.M1 to 9.0.0.M11 and 8.5.0 to 8.5.6 entered an infinite loop if a header was received that was larger than the available buffer. This made a denial of service attack possible.

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 2017-08-10. Last modified 2026-06-17.