CVE-2018-8037 Apache Tomcat Race Condition vulnerability

What is CVE-2018-8037?

CVE-2018-8037 is a medium-severity vulnerability in Apache Tomcat, published on 2 Aug 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

If an async request was completed by the application at the same time as the container triggered the async timeout, a race condition existed that could result in a user seeing a response intended for a different user. An additional issue was present in the NIO and NIO2 connectors that did not correctly track the closure of the connection when an async request was completed by the application and timed out by the container at the same time. This could also result in a user seeing a response intended for another user. Versions Affected: Apache Tomcat 9.0.0.M9 to 9.0.9 and 8.5.5 to 8.5.31.

Weakness: CWE-362

Which versions are affected by CVE-2018-8037?

4 open source packages ship an affected version, including org.apache.tomcat.embed:tomcat-embed-core. It affects 2 products.

Products include Apache Tomcat, Debian Debian Linux.

How do I fix CVE-2018-8037?

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

Is CVE-2018-8037 being exploited?

There is no known exploitation of CVE-2018-8037 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 GHSA-6v52-mj5r-7j2m, UBUNTU-CVE-2018-8037.