CVE-2024-23672

Denial of Service via incomplete cleanup vulnerability in Apache Tomcat

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.

CVE-2024-23672 has a CVSS score of 6.3 (Medium). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (11.0.0-M17, 10.1.19, 9.0.86, 8.5.99); upgrading removes the vulnerable code path.

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1. What is CVE-2024-23672? CVE-2024-23672 is a medium-severity security vulnerability in org.apache.tomcat:tomcat-websocket (maven), affecting versions >= 11.0.0-M1, <= 11.0.0-M16. It is fixed in 11.0.0-M17, 10.1.19, 9.0.86, 8.5.99.
2. How severe is CVE-2024-23672? CVE-2024-23672 has a CVSS score of 6.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which packages are affected by CVE-2024-23672?
   • org.apache.tomcat:tomcat-websocket (maven) (versions >= 11.0.0-M1, <= 11.0.0-M16)
   • org.apache.tomcat.embed:tomcat-embed-websocket (maven) (versions >= 11.0.0-M1, <= 11.0.0-M16)
4. Is there a fix for CVE-2024-23672? Yes. CVE-2024-23672 is fixed in 11.0.0-M17, 10.1.19, 9.0.86, 8.5.99. Upgrade to this version or later.
5. Is CVE-2024-23672 exploitable, and should I be worried? Whether CVE-2024-23672 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2024-23672 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2024-23672?
   • Upgrade org.apache.tomcat:tomcat-websocket to 11.0.0-M17 or later
   • Upgrade org.apache.tomcat:tomcat-websocket to 10.1.19 or later
   • Upgrade org.apache.tomcat:tomcat-websocket to 9.0.86 or later
   • Upgrade org.apache.tomcat:tomcat-websocket to 8.5.99 or later
   • Upgrade org.apache.tomcat.embed:tomcat-embed-websocket to 11.0.0-M17 or later
   • Upgrade org.apache.tomcat.embed:tomcat-embed-websocket to 10.1.19 or later
   • Upgrade org.apache.tomcat.embed:tomcat-embed-websocket to 9.0.86 or later
   • Upgrade org.apache.tomcat.embed:tomcat-embed-websocket to 8.5.99 or later

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