What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-03-13 · updated 2026-06-17
• Weakness: CWE-459

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.

Affected products

• Apache Tomcat: from 8.5.0 before 8.5.99; from 9.0.0 before 9.0.86; from 10.1.0 before 10.1.19; 11.0.0-milestone1, 11.0.0-milestone10, 11.0.0-milestone11, 11.0.0-milestone12, 11.0.0-milestone13, 11.0.0-milestone14 (+10) — fixed in 10.1.19, 8.5.99, 9.0.86
• Debian Linux: 10.0
• Fedoraproject Fedora: 39, 40

How to fix

Upgrade to a fixed version: Apache Tomcat 10.1.19, 8.5.99, 9.0.86. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/cmpswfx6tj4s7x0nxxosvfqs11lvdx2f
• http://www.openwall.com/lists/oss-security/2024/03/13/4
• https://lists.apache.org/thread/cmpswfx6tj4s7x0nxxosvfqs11lvdx2f
• https://lists.debian.org/debian-lts-announce/2024/04/msg00001.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3UWIS5MMGYDZBLJYT674ZI5AWFHDZ46B/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/736G4GPZWS2DSQO5WKXO3G6OMZKFEK55/
• https://security.netapp.com/advisory/ntap-20240402-0002/

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