CVE-2024-23672Network attack vector

Service interruption via unbounded WebSocket closure

Published Mar 13, 2024 · Updated Oct 29, 2025

Incomplete cleanup in Apache Tomcat allows remote attackers to retain WebSocket connections and consume server resources. WsSession starts the closing handshake without a deadline, so a client that withholds its close response leaves the session registered and its network connection open. A reachable WebSocket endpoint is required; repeated incomplete handshakes increase resource consumption until service is interrupted.

CVSS severity6.3
Medium
EPSS probability2.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incomplete cleanup in Apache Tomcat allows remote attackers to retain WebSocket connections and consume server resources. WsSession starts the closing handshake without a deadline, so a client that withholds its close response leaves the session registered and its network connection open. A reachable WebSocket endpoint is required; repeated incomplete handshakes increase resource consumption until service is interrupted.

The record

CVE
CVE-2024-23672
Published
Mar 13, 2024
Updated
Oct 29, 2025
Vendor
The Apache Software Foundation
Product
Apache Tomcat
Classifications
CWE-459, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 29, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1.0-M1 <=10.1.18
  2. Affected versionversion=11.0.0-M1 <=11.0.0-M16
  3. Affected versionversion=8.5.0 <=8.5.98
  4. Affected versionversion=9.0.0-M1 <=9.0.85

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Tomcatversion=10.1.0-M1 <=10.1.18; version=11.0.0-M1 <=11.0.0-M16; version=8.5.0 <=8.5.98; version=9.0.0-M1 <=9.0.85

Published CVSS scores

6.3GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-459Incomplete Cleanup
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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