CVE-2018-8034: Apache Tomcat

High severity, CVSS 7.5. EPSS: 21% chance of exploitation in the next 30 days.

The host name verification when using TLS with the WebSocket client was missing. It is now enabled by default. Versions Affected: Apache Tomcat 9.0.0.M1 to 9.0.9, 8.5.0 to 8.5.31, 8.0.0.RC1 to 8.0.52, and 7.0.35 to 7.0.88.

Affected products

• Apache Tomcat: from 7.0.35, up to and including 7.0.88; from 8.0.0, up to and including 8.0.52; from 8.5.0, up to and including 8.5.31; from 9.0.1, up to and including 9.0.9; version 8.0.0 only; version 9.0.0 only
• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only
• Debian Debian Linux: version 8.0 only; version 9.0 only
• Oracle Retail Order Broker: version 5.1 only; version 5.2 only; version 15.0 only

Published 2018-08-01. Last modified 2026-06-17.