CVE-2024-23672 Apache Tomcat: WebSocket DoS with incomplete closing handshake
Attackers can cause resource exhaustion and denial of service in Apache Tomcat by keeping WebSocket connections open without proper cleanup.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-23672?
CVE-2024-23672 is a medium-severity denial of service vulnerability in Apache Tomcat, published on 13 Mar 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Denial of Service via incomplete cleanup vulnerability in Apache Tomcat. It was possible for WebSocket clients to keep WebSocket connections open leading to increased resource consumption.This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.0-M16, from 10.1.0-M1 through 10.1.18, from 9.0.0-M1 through 9.0.85, from 8.5.0 through 8.5.98.
Older, EOL versions may also be affected.
Users are recommended to upgrade to version 11.0.0-M17, 10.1.19, 9.0.86 or 8.5.99 which fix the issue.
Weakness: CWE-459
Which versions are affected by CVE-2024-23672?
17 open source packages ship an affected version, including org.apache.tomcat.embed:tomcat-embed-websocket, tomcat and org.apache.tomcat:tomcat-websocket. It affects 3 products.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.tomcat.embed:tomcat-embed-websocket Maven | From 10.1.0-M1 | 10.1.19 |
org.apache.tomcat.embed:tomcat-embed-websocket Maven | From 10.1.0-M1 | 10.1.19 |
org.apache.tomcat.embed:tomcat-embed-websocket Maven | From 11.0.0-M1 | 11.0.0-M17 |
org.apache.tomcat.embed:tomcat-embed-websocket Maven | From 11.0.0-M1 | 11.0.0-M17 |
org.apache.tomcat.embed:tomcat-embed-websocket Maven | From 8.5.0 | 8.5.99 |
org.apache.tomcat.embed:tomcat-embed-websocket Maven | From 8.5.0 | 8.5.99 |
11 more packages
org.apache.tomcat.embed:tomcat-embed-websocket Maven | From 9.0.0-M1 | 9.0.86 |
org.apache.tomcat.embed:tomcat-embed-websocket Maven | From 9.0.0-M1 | 9.0.86 |
tomcat Bitnami | From 8.5.0 | 8.5.99, 9.0.86, 10.1.19 |
org.apache.tomcat:tomcat-websocket Maven | From 10.1.0-M1 | 10.1.19 |
org.apache.tomcat:tomcat-websocket Maven | From 10.1.0-M1 | 10.1.19 |
org.apache.tomcat:tomcat-websocket Maven | From 11.0.0-M1 | 11.0.0-M17 |
org.apache.tomcat:tomcat-websocket Maven | From 11.0.0-M1 | 11.0.0-M17 |
org.apache.tomcat:tomcat-websocket Maven | From 8.5.0 | 8.5.99 |
org.apache.tomcat:tomcat-websocket Maven | From 8.5.0 | 8.5.99 |
org.apache.tomcat:tomcat-websocket Maven | From 9.0.0-M1 | 9.0.86 |
org.apache.tomcat:tomcat-websocket Maven | From 9.0.0-M1 | 9.0.86 |
Linux distribution packages (23)
jws5-tomcat Red Hat:jboss_enterprise_web_server:5.8::el7 | All versions | 0:9.0.87-3.redhat_00003.1.el7jws |
jws5-tomcat-admin-webapps Red Hat:jboss_enterprise_web_server:5.8::el7 | All versions | 0:9.0.87-3.redhat_00003.1.el7jws |
jws5-tomcat-docs-webapp Red Hat:jboss_enterprise_web_server:5.8::el7 | All versions | 0:9.0.87-3.redhat_00003.1.el7jws |
jws5-tomcat-el-3.0-api Red Hat:jboss_enterprise_web_server:5.8::el7 | All versions | 0:9.0.87-3.redhat_00003.1.el7jws |
jws5-tomcat-java-jdk11 Red Hat:jboss_enterprise_web_server:5.8::el7 | All versions | 0:9.0.87-3.redhat_00003.1.el7jws |
jws5-tomcat-java-jdk8 Red Hat:jboss_enterprise_web_server:5.8::el7 | All versions | 0:9.0.87-3.redhat_00003.1.el7jws |
jws5-tomcat-javadoc Red Hat:jboss_enterprise_web_server:5.8::el7 | All versions | 0:9.0.87-3.redhat_00003.1.el7jws |
jws5-tomcat-jsp-2.3-api Red Hat:jboss_enterprise_web_server:5.8::el7 | All versions | 0:9.0.87-3.redhat_00003.1.el7jws |
jws5-tomcat-lib Red Hat:jboss_enterprise_web_server:5.8::el7 | All versions | 0:9.0.87-3.redhat_00003.1.el7jws |
jws5-tomcat-selinux Red Hat:jboss_enterprise_web_server:5.8::el7 | All versions | 0:9.0.87-3.redhat_00003.1.el7jws |
jws5-tomcat-servlet-4.0-api Red Hat:jboss_enterprise_web_server:5.8::el7 | All versions | 0:9.0.87-3.redhat_00003.1.el7jws |
jws5-tomcat-webapps Red Hat:jboss_enterprise_web_server:5.8::el7 | All versions | 0:9.0.87-3.redhat_00003.1.el7jws |
jws5-tomcat Red Hat:jboss_enterprise_web_server:5.8::el8 | All versions | 0:9.0.87-3.redhat_00003.1.el8jws |
jws5-tomcat-admin-webapps Red Hat:jboss_enterprise_web_server:5.8::el8 | All versions | 0:9.0.87-3.redhat_00003.1.el8jws |
jws5-tomcat-docs-webapp Red Hat:jboss_enterprise_web_server:5.8::el8 | All versions | 0:9.0.87-3.redhat_00003.1.el8jws |
jws5-tomcat-el-3.0-api Red Hat:jboss_enterprise_web_server:5.8::el8 | All versions | 0:9.0.87-3.redhat_00003.1.el8jws |
jws5-tomcat-javadoc Red Hat:jboss_enterprise_web_server:5.8::el8 | All versions | 0:9.0.87-3.redhat_00003.1.el8jws |
jws5-tomcat-jsp-2.3-api Red Hat:jboss_enterprise_web_server:5.8::el8 | All versions | 0:9.0.87-3.redhat_00003.1.el8jws |
jws5-tomcat-lib Red Hat:jboss_enterprise_web_server:5.8::el8 | All versions | 0:9.0.87-3.redhat_00003.1.el8jws |
jws5-tomcat-selinux Red Hat:jboss_enterprise_web_server:5.8::el8 | All versions | 0:9.0.87-3.redhat_00003.1.el8jws |
jws5-tomcat-servlet-4.0-api Red Hat:jboss_enterprise_web_server:5.8::el8 | All versions | 0:9.0.87-3.redhat_00003.1.el8jws |
jws5-tomcat-webapps Red Hat:jboss_enterprise_web_server:5.8::el8 | All versions | 0:9.0.87-3.redhat_00003.1.el8jws |
jws5-tomcat Red Hat:jboss_enterprise_web_server:5.8::el9 | All versions | 0:9.0.87-3.redhat_00003.1.el9jws |
Products include Apache Tomcat, Debian Debian Linux, Fedoraproject Fedora.
How do I fix CVE-2024-23672?
Upgrade org.apache.tomcat.embed:tomcat-embed-websocket to a fixed version for your release line: 10.1.19, 11.0.0-M17, 8.5.99 or 9.0.86.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-23672 being exploited?
There is no known exploitation of CVE-2024-23672 in the wild and no public exploit code.
Other vulnerabilities in Apache Tomcat
Sources
Also known as BIT-tomcat-2024-23672, CLSA-2024-1732637149, CLSA-2024-1732701424, CLSA-2025-1740230558, CLSA-2026-1793135910, DEBIAN-CVE-2024-23672 and 5 more.