CVE-2018-8034 The host name verification missing in Apache Tomcat

What is CVE-2018-8034?

CVE-2018-8034 is a high-severity vulnerability in Apache Tomcat, published on 1 Aug 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-295

Which versions are affected by CVE-2018-8034?

8 open source packages ship an affected version, including org.apache.tomcat.embed:tomcat-embed-core. It affects 4 products.

Products include Apache Tomcat, Canonical Ubuntu Linux, Debian Debian Linux, Oracle Retail Order Broker.

How do I fix CVE-2018-8034?

Upgrade org.apache.tomcat.embed:tomcat-embed-core to a fixed version for your release line: 7.0.90, 8.0.53, 8.5.32 or 9.0.10.

Is CVE-2018-8034 being exploited?

There is no known exploitation of CVE-2018-8034 in the wild and no public exploit code.

Other vulnerabilities in Apache Tomcat

• CVE-2025-24813 Apache Tomcat Path Equivalence Exploited Critical 10.0
• CVE-2016-8735 Apache Tomcat Remote Code Execution Exploited Critical 9.8
• CVE-2017-12617 Apache Tomcat Remote Code Execution Exploited High 8.1
• CVE-2017-12615 Apache Tomcat on Windows Remote Code Execution Exploited High 8.1
• CVE-2026-34486 Apache Tomcat Missing Encryption of Sensitive Data Exploited High 7.5

All Apache Tomcat vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DLA-1453-1, GHSA-46j3-r4pj-4835, UBUNTU-CVE-2018-8034.